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IJC-B Vol.44B(03) [March 2005] >

Title: Stereoselective synthesis of (2R, 3S, 22R, 23E)-6, 6-ethylenedioxy-22-hydroxy- 2, 3- isopropylidenedioxy-24-methyl-5-cholest-23-ene: An intermediate for the synthesis of castasterone, dolichosterone and brassinolide
Authors: Hazra, Braja G
Kumar, Tirunahari Pavan
Pore, Vandana S
Issue Date: Mar-2005
Publisher: CSIR
IPC CodeInt.Cl.7 C 07 J 5/00, 9/00
Abstract: Wittig reaction on (2R, 3S)-2,3-isopropylidenedioxy-6,6-ethylene-dioxy-5 -pregnane-(20S)-20-carbaldehyde 6, furnishes stereoselcctively an 22(E)- ,-unsaturated ketone 7, which on reaction with methyllithium followed by 1,3-carbonyl trans¬≠position and stereoselective reduction with DIBAL-H affords the title compound 10, an intermediate for castasterone, dolicho¬≠sterone and brassinolide.
Page(s): 611-614
ISSN: 0975-0983(Online); 0376-4699(Print)
Source:IJC-B Vol.44B(03) [March 2005]

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