Новые мультифункциональные органические кислоты Бренстеда как катализаторы реакций образования C-C и C-N связей тема диссертации и автореферата по ВАК РФ 02.00.03, кандидат химических наук Гугкаева, Залина Таймуразовна

  • Гугкаева, Залина Таймуразовна
  • кандидат химических науккандидат химических наук
  • 2008, Москва
  • Специальность ВАК РФ02.00.03
  • Количество страниц 155
Гугкаева, Залина Таймуразовна. Новые мультифункциональные органические кислоты Бренстеда как катализаторы реакций образования C-C и C-N связей: дис. кандидат химических наук: 02.00.03 - Органическая химия. Москва. 2008. 155 с.

Оглавление диссертации кандидат химических наук Гугкаева, Залина Таймуразовна

I. Введение.

II. Литературный обзор.

11.1. Хиральные органические кислоты Бренстеда как катализаторы реакций образования С-С связи.

11.1.1. Производные тиомочевины как катализаторы стереоселективного образования С-С связи.

11.1.2. Применение ТАДДОЛов в асимметрическом органическом катализе.

И.1.3. Использование производных БИНОЛа в асимметрическом органическом катализе.

II. 1.4. Применение производных фосфорной кислоты в асимметрическом органическом катализе.

11.2. Органический асимметрический катализ реакции триметилсилилциани-рования альдегидов и кетонов.

11.3. Энантиоселективная реакция Мукаямы.

11.4. Дополнительная активация кислотой Льюиса кислоты Бренседа.

11.5. Органокаталитическая энантиоселективная реакция Михаэля.

11.6. Использование производных (5)-пролина в асимметрической реакции альдольной конденсации.

Ш. Постановка задач и выбор объектов исследования.

IV. Обсуждение результатов.

IV.1. Синтез бисСад-ТАДДОЛов.

IV.2. Изучение каталитической активности бис-ТАДДОЛов в реакции триметилсилилцианирования бензальдегида.

IV.3. Реакция раскрытия циклогексеноксида различными нуклеофилами, катализируемая металлокомплексными соединениями.

IV.3.1. Изучение каталитичекой активности бис-ТАДДОЛов в реакции раскрытия оксиранового кольца циклогексеноксида TMSCN.

1У.4. Реакция Мукаямы, катализируемая бис-ТАДДОЛами.

1У,5. Применение катионов щелочных металлов как кислот Льюиса в асимметрическом катализе.

1У.5.1. Реакции присоединения ТМБСК к бензальдегиду и ацетофенону, катализируемые бис-ТАДДОЛами в присутствии сокатализаторов-солей щелочных металлов. ^

1У.5.2. Реакция трифторметилирования бензальдегида, катализируемая

ТАДДОЛами с добавкой КБ.

1У.5.3. Реакция раскрытия оксиранового кольца циклогексеноксида ТМБСМ, катализируемая бис-ТАДДОЛами в присутствии сокатализаторов-солей * щелочных металлов.

1У.5.4. Реакция раскрытия оксиранового кольца циклогексеноксида п-толуидином в присутствии сокатализаторов-солей щелочных металлов. ЮЗ

1У.6. Каталитическое асимметрическое протонирование в реакции Михаэля: присоединение диэтилового эфира малоновой кислоты к дегидроаланиновому субстрату, промотируемое моно- и бис-ТАДДОЛами.

1У.6.1. Реакция алкилирования производного аланина бензилбромидом в условиях межфазного катализа.

1У.7. Синтез производных (£)-пролина.

IV.7.1. Реакции, катализируемые производными (5)-пролина.

ГУ.7.2. Реакция альдольной конденсации, катализируемая производными

5)-пролина.

V. Экспериментальная часть.

VI. Выводы.

Рекомендованный список диссертаций по специальности «Органическая химия», 02.00.03 шифр ВАК

Список литературы диссертационного исследования кандидат химических наук Гугкаева, Залина Таймуразовна, 2008 год

1. G. Guillena, С. Narjera and D. Ramon /Enantioselective direct aldol reaction: the blossoming of modern organocatalysis/ Tetrahedron: Asymmetry. 2007, 18, 2249-2293

2. A. Dondoni and A. Massi /Asymmetric Organocatalysis: From Infancy to Adolescence/ Angew. Chem. Int. Ed., 2008, 47, 2-25

3. Т. Akiyama /Stronger Bronsted Acids/ Chemical Reviews, 2007, Vol. 107, No. 12 5744-5757

4. T. Akiyama, J. Itoh,and K. Fuchibe /Recent Progress in Chiral Bronsted Acid Catalysis/ Adv. Synth. Catal., 2006, 348, 999 1010

5. M. S.Sigman, E. N.Jacobsen /Schiff Base Catalysts for the Asymmetric Strecker Reaction Identified and Optimized from Parallel/ J. Am. Chem. Soc. 1998,120, 4901-4902

6. Petr Vachal and Eric N. Jacobsen /Structure-Based Analysis and Optimization of a Highly Enantioselective Catalyst for the Strecker Reaction/ J. Am. Chem. Soc., 2002,124, 10012-10014.

7. A. Berkessel, F. Cleemann, S. Mukherjee, T. Müller, J. Lex /Highly Efficient Dynamic Kinetic Resolution of Azlactones by Urea-Based Bifiinctional Organocatalysis / Angew. Chem. Int. Ed., 2005, 44, .807-811

8. Y. Sohtome, Y. Hashimoto, K. Nagasawa /Guanidine-Thiourea Bifunctional Organocatalyst for the Asymmetric Henry (Nitroaldol) Reaction/ Adv. Synth. Catal., 2005, 347, 1643-1648

9. D. Seebach, A. K. Beck, A. Heckel /TADDOLs, their derivatives, and TADDOL analogues: versatile chiral auxiliaries./ Angew. Chem. Int. Ed., 2001, 40, 92-138

10. M. Yamaguchi, B. Trost, I. Fleming, S. Schreiber / Lewis Acid Promoted Addition Reactions of Organometallic Compounds/ Comprehensive Organic Synthesis, Vol. 1,. Pergamon Oxford, 1991, 325-353

11. Y. Belokon, K. Kochetkov, T. Churkina, N. Ikonnikov, S. Orlova, V. Smirnov, A. Chesnokov /Asymmetric Michael addition of a glycine synthon to methyl methacrylate, mediated by disodium TADDOLate/Mendeleev Commun.1997, 7,137-138

12. N. Momiyama, H. Yamamoto /Acid Catalysis of Achiral Enamine for Regio- and Enantioselective Nitroso Aldol Synthesis/ J. Am. Chem. Soc., 2005,127, 1080-1081

13. Y. Huang, A. K. Unni, A. N. Thadani, V. H. Rawal /Single enantiomers from a chiral-alcohol catalyst/ Nature, 2003, 424,. 146.

14. A. N. Thadani, A. R. Stankovic, V. H Rawal /Enantioselective Diels-Alder reactions catalyzed by hydrogen bonding/ Proc. Natl. Acad. Sci., 2004,101,. 5846 5850.

15. H. Du, D. Zhao, K. Ding /Enantioselective catalysis of the hetero-Diels-Alder reaction between Brassard's diene and aldehydes by hydrogen-bonding activation: a one-step synthesis of (iSr)-(+)-Dihydrokawain/ Chem. Eur. J., 2004,10,. 5964-5970

16. X. Zhang, H. Du, Z. Wang, Y. Wu and K. Ding /Experimental and Theoretical Studies on the Hydrogen-Bond-Promoted Enantioselective Hetero-Diels-Alder Reaction of Danishefsky's Diene with Benzaldehyde/J. Org. Chem., 2006, 71, 2862-2869

17. J. D. McGilvra, A. K. Unni, K. Modi, V.H. Rawal /Highly Diastereo- and Enantioselective Mukaiyama Aldol Reactions Catalyzed by Hydrogen Bonding/ Angew.Chem. Int. Ed., 2006, 45, 6130-6133

18. N. Momiyama, H. Yamamoto /Bronsted Acid Catalysis of Achiral Enamine for Regio-and Enantioselective Nitroso Aldol Synthesis/ J. Am. Chem. Soc., 2005,127, 1080-1081

19. K. Tanaka, F. Toda /Solvent-free organic synthesis/ Chem. Rev., 2000, 100, 10251074.

20. K. Tanaka, S. Honke, Z. Urbanczyk-Lipkowska, F. Toda /New chiral hosts derived from dimeric tartaric acid: efficient optical resolution of aliphatic alcohols by inclusion complexation/ Eur. J. Org. Chem., 2000, 3171-3176.

21. Y. Belokon, K. Kochetkov, T. Churkina, N. Ikonnikov, S. Orlova, V. Smirnov, A. Chesnokov /Asymmetric Michael addition of a glycine synthon to methyl methacrylate, mediated by disodium TADDOLate/Mendeleev Commun., 1997, 7,137-138

22. Z Jaszay, G. Nemeth, T.Pham, I. Petnehazy, A.Griin, L. Toke /Catalytic enantioselective Michael addition in the synthesis of a-amonophosphonates/ Tetrahedron:Asymmetry, 2005,16, 3837-3840

23. K. Matsui, S. Takizawa, H. Sasai /Bifiinctional Organocatalysts for Enantioselective aza-Morita-Baylis-Hillman Reaction/ J. Am. Chem. Soc., 2005,127, 3680-3681

24. A. Tillman, D. Dixon /An enantioselective Bronsted acid catalyzed enamine Mannich reaction/ Org. Biomol. Chem., 2007, 5, 606-609

25. S. Lou, P. Moquist, S. Schaus /Asymmetric Allylboration of Ketones Catalyzed by Chiral Diols/ J. Am.Chem. Soc., 2006,128, 12660-12661

26. D. Uraguchi, K. Sorimachi, M. Terada /Organocatalytic Asymmetric Aza-Friedel-Crafts Alkylation ofFuran/ J. Am. Chem. Soc., 2004,126,11804-11805

27. T. Akiyama, Y. Saitoh, H. Morita, K. Fuchibe /Enantioselective Mannich-Type Reaction Catalyzed by a Chiral Bransted Acid Derived from TADDOL/ Adv.Synth. Catal., 2005,347, 1523-1526

28. G. B. Rowland, H. Zhang, E. B. Rowland, S. Chennamadhavuni, Y. Wang, J. C. Antilla/Bronsted Acid-Catalyzed Imine Amidation/ J. Am. Chem. Soc., 2005, 127, 1569615697

29. I. P. Holmes, J. M Brunei /Chemically catalyzed asymmetric cyanohydrin syntheses/ Angew. Chem. Int. Ed., 2004, 43, 2752 2778

30. Michael North /Synthesis and applications of non-racemic cyanohydrins/ Tetrahedron: Asymmetry, 2003, 14, 147-176

31. J.-I. Oku, S. Inoue, /Asymmetric cyanohydrin synthesis catalysed by a synthetic cyclic dipeptide/ J. Chem. Soc., Chem. Commun. 1981, 229

32. D. E. Fuerst, E. N. Jacobsen /Thiourea-Catalyzed Enantioselective Cyanosilylation of Ketones//. Am. Chem. Soc, 2005,127, 8964-8965

33. Stephan J. Zuend and Eric N. Jacobsen /Cooperative Catalysis by Tertiary Amino-Thioureas ¡Mechanism and Basis for Enantioselectivity of Ketone Cyanosilylation/. J. Am. Chem. Soc., 2007,129, 15872-15883

34. B. Qin, X. Liu, J. Shi, K. Zheng, H. Zhao, X. Feng /Enantioselective Cyanosilylation of a, a- Dialkoxy Ketones Catalyzed by Proline-Derived in-Situ-Prepared N-Oxide as Bifunctional Organjcatalyst/ J. Org. Chem., 2007, 72,2374-2378

35. T. Shi-Kai, D. A. Li /Highly enantioselective chiral Lewis base-catalyzed asymmetric cyanation of ketones/ J. Am. Chem. Soc., 2001,123, 6195-6196

36. T. Shi-Kai, H. Ran., D. Li /Catalytic asymmetric cyanosilylation of ketones with chiral Lewis base/ J. Am. Chem. Soc., 2003, 125,. 9900-9901

37. Scott E. Denmark and Won-jin Chung /Lewis Base Catalyzed Addition of Trimethylsilyl Cyanide to Aldehydes/ J. Org. Chem., 2006, 71,4002-4005

38. Jinhua J. Song, Fabrice Gallou, Jonathan T. Reeves, Zhulin Tan, Nathan K. Yee, and Chris H. Senanayake /Activation of TMSCN by N-Heterocyclic Carbenes for Facile Cyanosilylation of Carbonyl Compounds/ J. Org. Chem., 2006, 71, 1273-1276

39. Y. Suzuki, A. Bakar, M. K. Muramatsu, M. Sato /Cyanosilylation of aldehydes catalyzed by N-heterocyclic carbenes/ Tetrahedron, 2006, 62, 4227-4231

40. V. B. Gondi, M. Gravel, V. H. Rawal /Hydrogen Bond Catalyzed Enantioselective Vinylogous Mukaiyama Aldol Reaction/ Org. Lett., 2005; 7 (25); 5657-5660

41. T. Hollis, B. Bosnich /Homogeneous Catalysis. Mechanisms of the Catalytic Mukaiyama Aldol and Sakura Allylation Reactions/ J. Am. Chem. Soc., 1995, 7/7, 45704581

42. H. Yamamoto K. Futatsugi /"Designer acids": combined acid catalysis for asymmetric synthesis/ Angew. Chem. Int. Ed., 2005, 44, 1924-1942

43. K. Ishihara, M. Kaneeda, and H. Yamamoto /Lewis Acid Assisted Chiral Bronsted Acid for Enantioselective Protonation of Silyl Enol Ethers and Ketene Bis(trialkylsilyl) Acetals/ J. Am. Chem. Soc., 1994, 116, 11179-11180

44. K. Ishihara, S. Nakamura, M. Kaneeda, and H. Yamamoto /First Example of a Highly Enantioselective Catalytic Protonation of Silyl Enol Ethers Using a Novel Lewis Acid-Assisted Bransted Acid System/ J. Am. Chem. Soc. 1996,118, 12854-12855

45. K. Mikami, S. Matsukawa /Asymmetric synthesis by enantiomer-selective activation of racemic catalysts / Nature, 1997, 385, 613-615

46. S. Nakamura, M. Kaneeda, K. Ishihara, H. Yamamoto /Enantioselective Protonation of Silyl Enol Ethers and Ketene Disilyl Acetals with Lewis Acid-Assisted Chiral Br0nsted

47. J. Wang, H. Li, L. Zu, W. Wang /Enantioselective Organocatalytic Michael Addition Reactions between N-Heterocycles and Nitroolefines/ Org. Lett., 2006; «5 (7); 1391-1394

48. T. Ooi, K. Maruoka /Asymmetric Organocatalysis of Structurally Well-Defined Chiral Quaternary Ammonium Fluorides/ Acc. Chem. Res., 2004, 37, 526-533

49. T. Ooi, D. Ohara, K. Fukumoto, K. Maruoka /Importance of Chiral Phase-Transfer Catalysts with Dual Functions in Obtaining High Enantioselectivity in the Michael Reaction of Malonates and Chalcone Derivatives/ Org. Lett., 2005, Vol. 7 No 15, 31953197

50. B. List, P. Pojarliev, H. J. Martin /Efficient Proline-Catalyzed Michael-Additions of Unmodified Ketones to Nitroolefins/. Org. Lett., 2001, 3, 2423-2425

51. T. Bui, C. Barbas /A proline-catalyzed asymmetric Robinson annulation reaction./ Tetrahedron Lett., 2000, 41, 6951-6954

52. J. M. Betancort, K. Sakthivel, R. Thayumanavan, C. Barbas /Catalytic Enantioselective Direct Michael Additions of Ketones to Alkylidene Malonates/ Tetrahedron Lett., 2001, 42, 4441-4444

53. J. M. Betancort, K. Sakthivel, R. Thayumanavan, F. Tanaka, C. F. Barbas /Catalytic direct asymmetric Michael reactions: addition of unmodified ketone and aldehyde donors to alkylidene malonates and nitro olefins /Synthesis, 2004, 1509-1521

54. P. Garcia-Garcia, A. Ladepeche, R. Haider, B. List /Catalytic Asymmetric Michael Reactions of Acetaldehyde/ Angew. Chem. Int. Ed., 2008, 47, 1-4

55. A. Lattanzi /Enantioselective Michael addition of malonate esters to nitroolefins organocatalyzed by diaryl-2-pyrrolidinemethanols/ Tetrahedron: Asymmetry, 2006, 77, 837-841

56. Z. G. Hajos, D. R. Parrish /Asymmetric synthesis of bicyclic intermediates of natural product chemistry/ J. Org.Chem., 1974, 39, 1615-1621

57. U. Eder, G. Sauer, R. Wiechert /New Type of Asymmetric Cyclization to Optically Active Steroid CD Partial Structures/ Angew. Chem., Int. Ed. Engl., 1971,10,496-497

58. Z. G. Hajos, D. R. Parrish /Asymmetric synthesis of optically active polyciclic organic compounds/ German Patent DE 2102623, Jul 29, 1971

59. U. Eder, G. Sauer, R. Wiechert /Optically active 1,5-indanone and 1,6-naphthalenedione derivatives/ German Patent DE 2014757, Oct 7, 1971

60. Z. G. Hajos /Proline Catalyzed Asymmetric Cyclization. Theory of the Reaction/ Chemistry Preprint Archive, Volume 2002, Issue 9, September 2002, 84-100

61. C. Agami, J. Levisalles, C. Puchot /A New Diagnostic Tool for Elucidating the Mechanism of Enantioselective Reactions. Application to the Hajos-Parrish Reaction/ J. Chem. Soc., Chem. Comnmn., 1985,441-442

62. C. Agami, C. Puchot /Kinetic Analysis of the Dual Catalysis by Proline in the Asymmetric Intramolecular Aldol Reaction U. Mol Catal., 1986, 38, 341-343

63. C. Agami, C. Puchot, H. Sevestre /Is the Mechanism of the Proline-Catalyzed Enantioselective Aldol Reaction Related toBiochemical Processes?/ Tetrahedron Lett., 1986,27, 1501-1504

64. C. Agami /Mechanism of the Proline-Catalyzed Enantioselective Aldol Reaction/ Recent. Advances. Bull. Soc. Chim. Fr., 1988, 3, 499-507

65. C. Agami, N. Platzer, H. Sevestre /Enantioselective Cyclizations of Acyclic 1,5-Diketones/Bull. Soc. Chim. Fr., 1987, 2, 358-360

66. B. List, R. A. Lerner, C. F. Barbas /Proline-Catalyzed Direct Asymmetric Aldol Reactions//. Am. Chem. Soc., 2000,122, 2395-2396

67. K. Sakthivel, W. Notz, T. Bui, C. F. Barbas /Amino acid catalyzed direct asymmetric aldol reactions: a bioorganic approach to catalytic asymmetric carbon-carbon bond-forming reactions/ J. Am. Chem. Soc., 2001,123, 5260-5661

68. B. List /Asymmetric aminocatalysis/ Synlett, 2001,11, 1675-1686

69. Y. Fu, Z. Li, L. Ding, J. Tao, S. Zhang, M. Tang /Direct asymmetric aldol reaction catalyzed by simple prolinamide phenols/ Tetrahedron: Asimmetry, 17,2006, 3351-3357

70. A. Russo, G. Botta, A. Lattanzi /Highly stereoselective direct aldol reactions catalyzed by (53-NOBIN-l-prolinamide / Tetrahedron, 2007, 63, 11886-11892

71. X. Xu, Y. Wang, L. Cun, L. Gong /L-Proline amides catalyze direct asymmetric aldol reactions of aldehydes with methylthioacetone and fluoroacetone/ Tetrahedron: Asymmetry, 2007,18, 237-242

72. V. Maya, M. Raj, V. Singh /Highly Enantioselective Organocatalytic Direct Aldol Reaction in an Aqueous Medium/ Org. Lett., 2007, 9, 13, 2593-2595

73. M. Gruttadauria, F. Giacalone, A. Marculescu, R. Noto /Novel Prolinamide-Supported Polystyrene as Highly Stereoselective and Recyclable Organocatalyst for the Aldol Reaction/ Adv. Synth. Catal., 2008, 350, 1397-1405

74. Y. Takemoto, S. Kuraoka, N. Hamaue, К. Aoe, H. Hiramatsu, Ch. Iwata /Enantioselective Cu-catalyzed 1,4-addition of Me3Al to a 4,4-disubstituted cyclohexa-2,5-dienone/ Tetrahedron, 1996, Volume 52, Issue 45, 14079-14360

75. T. Novak, V. Ujj, J. Schindler, M. Czugler, M.Kubinyi, Z. Mayer, E. Fogassy, G. Keglevieh /Resolution of l-Substituted-3-methyl-3-phospholene 1-oxides by Molecular Complex Formation with TADDOL Derivatives/ Tetrahedron: Asymmetry, 2007, 18, 2965-2972

76. H. Yamashita, T. Mukaiyama /Asymmetric Ring-Opening of cyclohexene Oxide with Various Thiols Catalyzed by Zinc Lq~Tartrate/ Chemistry Letter, 1985, Vol. 14, No.ll, 1643-1646

77. M. Hayashi, K. Kohmura, N. Oguni /Asymmetric Ring Opening of Symmetrical Epoxides with Trimethylsilyl Azide Using Chiral Titanium Complexes/ Synlett, 1991, 774-777

78. L. Martinez, J. Leighton, D. Carsten, and E. Jacobsen /Highly Enantioselective Ring Opening of Epoxides Catalyzed by (salen)Cr(III) Complexes/ J. Am. Chem. Soc., 1995, 117,. 5897-5898

79. Xue-Long Hou, Jie Wu, Li-Xin Dai, Li-Jun Xia, Ming-Hua Tan /Desymmetric ring-opening of meso-Qpoxides with anilines: a simple way to chiral p-amino alcoholsg/ Tetrahdron: Asymmetry, 1998, 9, 1747-1752

80. S. Sagawa, H. Abe, Y. Hase, T. Inaba /Catalytic Asymmetric Aminolysis of 3,5,8-Trioxabicyclo5.1.0.octane Providing an Optically Pure 2-Amino-l,3,4-butanetriol Equivalent/ J. Org. Chem., 1999, 64,4962-4965

81. C. Schneider, A. Sreekanth, E. Mai /Scandium-Bipyridine-Catalyzed Enantioselective Addition of Alcohols and Amines to meso-Epoxides/ Angew. Chem. Int. Ed., 2004, 43, 5691-5694

82. S. Azoulay, K. Manabe, and S. Kobayashi /Catalytic Asymmetric Ring Opening of w&yo-Epoxides with Aromatic Amines in Water/ Org. Lett., 2005, 7, 4593-4595

83. C. Ogawa, S. Azoulay, S. Kobayashi /For a Bi(OTf)3-bipyridine-catalyzed aminolysis of weso-epoxide/ Heterocycles, 2006, 66, 201

84. B. Gao, Y. Wen, Z. Yang, X. Huang, X. Liu, X. Feng /Asymmetric Ring Opening of /weso-Epoxides with Aromatic Amines Catalyzed by a New Proline-Based -DioxideIndium Tris(triflate) Complex/ Adv. Synth. CataL, 2008, 350, 385-390

85. B. Cole, K. Shimizu, C. Krueger, J. Harrity, M. Snapper, A. Hoveyda /Discovery of Chiral Catalysts through Ligand Diversity: Ti-Catalyzed Enantioselective Addition of TMSCN to meso Epoxides/ Angew. Chem. Int. Ed., 1996, 35, 1668-1671

86. S. Schaus and E. Jacobsen /Asymmetric Ring Opening of Meso Epoxides with TMSCN Catalyzed by (pybox)lanthanide Complexes/ Org. Lett., 2000, 2, 1001-1004

87. A. G. Carel, M. Weijers /.Enantioselective hydrolysis of aryl, alicyclic and aliphatic epoxides by Rhodotorula glutinisi Tetrahedron: Asymmetry, 1997, 8, 639-647 '

88. S. Fukuzuni, K. Ohkudo /Fluorescence Maxima of 10-Methylacridone-Metal Ion Salt Complexes: A Convenient and Quantitative Measure of Lewis Acidity of Metal Ion Salts/ J. Am. Chem. Soc., 2002,124, 10270-10271

89. A. Casaschi, G. Desimoni, G. Faita, A. G. Invernizzi, S. Lanati, and P. Righetti /Catalysis with inorganic cations. 2. The effect of some perchlorates on Diels-Alder reaction rates/ J. Am. Chem. Soc., 1993,115, 8002-8007

90. A. N. Pushin, S. E. Tkachewko, L. V. Martynov; Doklady Akademii Nauk SSSR, 1988,299, 154

91. G. Desimoni, G. Faita, P.P. Righetti, G. Tacconi /Lithium Perchlorate Catalysis of the Hetero Diels-Alder Reaction: a Specific Lithium Cation Effect / Tetrahedron, 1991, 47, 8399-8406

92. M. Reetz, B. Raguse, C. Marth, H. Hugel, T. Bach, D. Fox /A Rapid Injection NMR Study of the Chelation Controlled Mukaiyama Aldol Addition: TiCl4 Versus LiC104 as the Lewis Acid /Tetrahedron, 1992, 48, 5731-5742

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