A stereoselective synthesis of (±)-perhydorgephyrotoxin (3) starting from 1, 3-bis(trimethyl-siloxy)-1, 3-butadiene and ethyl trans-2-octenoate is described. A crucial step is reductive decarboxylation of the γ-carbamoyloxy-α, β-enoate (6) with lithium dibutylcuprate to yield the β, γ-enoate (40).
本研究描述了以 1,3-双(三甲基
硅氧基)-
1,3-丁二烯和
反式-2-辛烯酸乙酯为起始原料,立体选择性合成 (±)-perhydorgephyrotoxin (3)。其中一个关键步骤是用
苝酸二丁酯
锂对γ-
氨基甲酰氧基-α,β-烯酸酯(6)进行还原脱羧反应,生成β,γ-烯酸酯(40)。