Studies on steroidal plant growth regulators 22. Osmium tetroxide catalyzed asymmetric dihydroxylation of the (22E, 24R)- and the (22E, 24S)-24-Alkyl steroidal unsaturated side chain
作者:Li-Qiang Sun、Wei-Shan Zhou、Xin-Fu Pan
DOI:10.1016/s0957-4166(00)86139-x
日期:1991.1
The osmium tetroxide catalyzed asymmetric hydroxylation of the (22E, 24R)- and (22E, 24S)-24-alkyl steroidal unsaturated sidechain are described. High stereoselectivity was obtained on dihydroxylation of these unsaturated sidechains, when the 24-alkyl is methyl, while in the case of a 24-ethyl substituent the chiral ligand would be the dihydroquinine p-chlorobenzoate (DHQ).