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Volumn 12, Issue 4, 2006, Pages 1205-1215

Catalytic asymmetric Mannich-type reactions activated by ZnF2 chiral diamine in aqueous media

Author keywords

Aqueous media; Asymmetric catalysis; Lewis acids; Mannich reaction; Water chemistry

Indexed keywords

AMINES; CATALYST ACTIVITY; FLUORIDE MINERALS; ORGANIC SOLVENTS; REACTION KINETICS; SILICON; SOLUTIONS;

EID: 31444449382     PISSN: 09476539     EISSN: 15213765     Source Type: Journal    
DOI: 10.1002/chem.200500673     Document Type: Article
Times cited : (77)

References (75)
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    • Details are shown in the Supporting Information
    • Details are shown in the Supporting Information.
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    • A similar fluoride-catalyzed mechanism was partly proposed for aldol reactions catalyzed by TBAF or tris(diethylamino)sulfonium difluorotrimethylsiliconate (TASF) see: a) E. Nakamura, M. Shimizu, I. Kuwajima, J. Sakata, K. Yokoyama, R. Noyori, J. Org. Chem. 1983, 48, 932-945;
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    • For a possible transition state model see the Supporting Information
    • For a possible transition state model see the Supporting Information.
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    • Since cationic micelles are known to catalyze anionic processes, it seems likely that the addition of a cationic surfactant facilitates the formation of fluorosiliconate B (Scheme 1). accelerating the Mannich-type reaction. For selected examples of the reactions that were accelerated by the addition of a cationic surfactant see: a) M. T. A. Behme. J. G. Fullington, R. Noel, E. H. Cordes, J. Am. Chem. Soc. 1965, 87, 266-270;
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    • note
    • When CTAB (5 mol %) was used for the reaction in Table 12 (entry 1) the reaction was not remarkably accelerated, and the ee was decreased (56% yield, 92% ee, 5 h).
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    • note
    • In reference [8], we reported that the reaction with 5 proceeded sluggishly under neat conditions (4% yield, synlanti 91:9, 94% ee (syn)). However, further investigations have since revealed that this reaction can produce a higher yield (32% yield, syn/anti 95:5, 95% ee (syn): Table 13, entry 8). The low yield reported in reference [8] is probably a result of the poor reproducibility of the reaction when no solvent is used.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.