A new synthesis of [26,28-2H6]brassinolide and [26,28-2H6]castasterone via an unusual methyl migration
作者:A. Kolbe、A. Porzel、J. Schmidt、G. Adam
DOI:10.1002/jlcr.662
日期:2003.3.15
Deuterium-labelled brassinosteroids, namely [26,28-2H6]castasterone, 8, and [26,28-2H6]brassinolide, 9, were synthesized starting from 6,6- ethylenedioxy-20-formyl-2α,3α-isopropylidenedioxy-5α-pregnane, 1, and 3-[2H3]methyl-but-1-yne-[4,4,4-2H3], 11. Upon alkylating cleavage of the epoxide 6 with trimethylaluminium-n-butyllithium an unusual migration of a neighbouring [2H3]methyl group takes place
氘标记的油菜素类固醇,即 [26,28-2H6]castasterone, 8 和 [26,28-2H6] 油菜素内酯, 9,是从 6,6- ethylenedioxy-20-formyl-2α,3α-isopropylidenedioxy-5α 合成的-pregnane, 1, and 3-[2H3]methyl-but-1-yne-[4,4,4-2H3], 11. 用三甲基铝-正丁基锂对环氧化物 6 进行烷基化裂解后,相邻的不寻常迁移[2H3] 甲基在 26 和 28 位发生氘化。 版权所有 © 2002 John Wiley & Sons, Ltd。