Homochiral Lithium Amides: Enantioselective Deprotonation of Cyclohexene Oxide
摘要:
Reaction of cyclohexene oxide with chiral lithium amides has been studied and (S)-2-cyclohexen-l-ol was prepared in 20-82% ee. The optical purity was determined by proton NMR measurement of a-methoxy-a(trifluoromethyl)phenylacetic acid (MTPA) derivative of the corresponding alcohol.
Homochiral Lithium Amides: Enantioselective Deprotonation of Cyclohexene Oxide
摘要:
Reaction of cyclohexene oxide with chiral lithium amides has been studied and (S)-2-cyclohexen-l-ol was prepared in 20-82% ee. The optical purity was determined by proton NMR measurement of a-methoxy-a(trifluoromethyl)phenylacetic acid (MTPA) derivative of the corresponding alcohol.
CATALYTIC ENANTIOSELECTIVE SILYLATIONS OF SUBSTRATES
申请人:Hoveyda Amir H.
公开号:US20090312559A1
公开(公告)日:2009-12-17
The present invention provides methods, compositions and systems for silylation of substrates, including direct asymmetric silylation of a substrate to provide enantiomerically enriched silylated products.
Small organic molecule catalyzed enantioselective direct aldol reaction in water
作者:Swapandeep Singh Chimni、Dinesh Mahajan
DOI:10.1016/j.tetasy.2006.07.016
日期:2006.8
Protonated pyrrolidine based small organic molecules have been designed and evaluated for the asymmetric direct aldol reaction in water. The designed organocatalysts are multifunctional in nature and exploit the combined effect of hydrogen bonding and hydrophobic interactions for enantioselective catalysis in water. As a result a unique direct asymmetric aldol reaction in water catalyzed by a small organic molecule having an amide linkage has been developed. The developed catalyst affords chiral beta-hydroxyketones in good yields (93%) and enantioselectivities (upto 62%) in water. (c) 2006 Elsevier Ltd. All rights reserved.
Homochiral Lithium Amides: Enantioselective Deprotonation of Cyclohexene Oxide
作者:Bhuniya、Singh
DOI:10.1080/00397919408011196
日期:1994.2
Reaction of cyclohexene oxide with chiral lithium amides has been studied and (S)-2-cyclohexen-l-ol was prepared in 20-82% ee. The optical purity was determined by proton NMR measurement of a-methoxy-a(trifluoromethyl)phenylacetic acid (MTPA) derivative of the corresponding alcohol.