Convergent Synthesis of the E‘FGH‘ Ring Fragment of Ciguatoxin 1B via an Acetylene Cobalt Complex Strategy
作者:Shigeyuki Takai、Minoru Isobe
DOI:10.1021/ol0256264
日期:2002.4.1
[reaction: see text] A convergent synthesis of the E'FGH' ring fragment of ciguatoxin has been accomplished through (i) coupling between the E' ring-acetylide and the H' ring-aldehyde, (ii) stereoselective F ring cyclization via an acetylene cobalt complex, (iii) conversion to a carbonyl function, and (iv) reductive hydroxy-ketone cyclization to construct the G ring.
[反应:见正文]通过(i)E'环乙炔化物和H'环醛之间的偶联,(ii)通过以下方式的立体选择性F环环化,实现了瓜瓜毒素E'FGH'环片段的聚合合成乙炔钴配合物,(iii)转化为羰基官能团,和(iv)还原性羟基-酮环化以构建G环。