The development and use of a general route to brassinolide, its biosynthetic precursors, metabolites and analogues
作者:A. L. Hurski、Yu. V. Ermolovich、V. N. Zhabinskii、V. A. Khripach
DOI:10.1039/c4ob02197e
日期:——
A new method for the construction of steroid sidechains through the addition of lithium salts of dithianes to a C-22 aldehyde was developed. An efficient one-pot procedure for the preparation of a suitable C-22 aldehyde from commercial epibrassinolide in three steps in 86% isolated yield was described. Enantioselective hydroxymethylation of isovaleraldehyde and Kulinkovich cyclopropanation of silylated