作者:Kenshu Fujiwara、Akiyoshi Goto、Daisuke Sato、Yuko Ohtaniuchi、Hideki Tanaka、Akio Murai、Hidetoshi Kawai、Takanori Suzuki
DOI:10.1016/j.tetlet.2004.07.145
日期:2004.9
Convergent synthesis of the ABCDE-ring part (2) of ciguatoxin CTX3C (1) has been achieved. A carbanion stabilized by a dimethyldithioacetal S-oxide group in the AB-ring part (4) readily reacted with an aldehyde group in the E-ring part (5). The resulting adduct was facilely converted to the corresponding β,γ-unsaturated α,ε-dihydroxy ketone (3). The subsequent reductive hydroxy-ketone-cyclization reactions
已经实现了瓜瓜毒素CTX3C(1)的ABCDE环部分(2)的收敛合成。通过AB环部分(4)中的二甲基二硫缩醛S-氧化物基团稳定的碳负离子容易与E环部分(5)中的醛基反应。将所得的加合物容易地转化为相应的β,γ-不饱和α,ε-二羟基酮(3)。随后的还原性羟基-酮环化反应有效地构建了CD环部分。因此,由AB环和E环部分(4和5)以10个步骤简明地合成了ABCDE环部分(2),总产率为11%。