Enantioselectively catalyzed intramolecular cyclopropanations of unsaturated diazo carbonyl compounds
作者:William G. Dauben、Robert T. Hendricks、Michael J. Luzzio、Howard P. Ng
DOI:10.1016/s0040-4039(00)97218-6
日期:1990.1
A series of unsaturated α-diazo carbonyl compounds underwent enantioselective intramolecularcyclopropanation (ee = 4–77%) when treated with an enantiomerically pure chiral copper catalyst. The nature of the diazo substrate was critical: α-diazo ketones gave the best enantioselectivities whereas α-diazo β-keto ester systems showed diminished enantioselectivities.
ROUSSEAU, G.;SLOUGUI, N., J. AMER. CHEM. SOC., 1984, 106, N 23, 7283-7285
作者:ROUSSEAU, G.、SLOUGUI, N.
DOI:——
日期:——
2-SUBSTITUTED VITAMIN D ANALOGUES AND THEIR THERAPEUTIC USES
申请人:K.U. Leuven Research and Development
公开号:EP1601646A2
公开(公告)日:2005-12-07
[EN] VITAMIN D ANALOGUES AND THEIR THERAPEUTIC USES<br/>[FR] ANALOGUES DE LA VITAMINE D ET LEURS UTILISATIONS THERAPEUTIQUES
申请人:LEUVEN K U RES & DEV
公开号:WO2004080922A2
公开(公告)日:2004-09-23
The present invention relates to analogues of vitamin D namely 14-epi-2-alkyl-19-nor vitamin D derivatives. Also a general method for the synthesis and the biological activities are described. The general formula is: (I) where R (α or β oriented) represents an alkyl substituent and X part of a typical side chain of vitamin D or of one of its established analogues.