Synthesis of the C(29)−C(45) Bis-pyran Subunit (E−F) of Spongistatin 1 (Altohyrtin A)
作者:Glenn C. Micalizio、Anatoly N. Pinchuk、William R. Roush
DOI:10.1021/jo001236o
日期:2000.12.1
A synthesis of the C(29)-C(45) bis-pyran subunit 2 of spongistatin 1 (1a) is described. The synthesis proceeds in 19 steps from the chiral aldehyde ent-7, and features highly diastereoselective alpha-alkoxyallylation reactions using the gamma-alkoxy substituted allylstannanes 17 and 19, as well as a thermodynamically controlled intramolecular Michael addition to close the F-ring pyran. The E ring was
描述了海绵抑素1(1a)的C(29)-C(45)双吡喃亚基2的合成。合成过程从手性醛ent-7开始以19个步骤进行,并具有使用γ-烷氧基取代的烯丙基锡烷酮17和19的高度非对映选择性的α-烷氧基烯化反应,以及热力学控制的分子内迈克尔加成反应以封闭F环吡喃。E环通过F环甲基酮3和2,3-合成醛4的Mukaiyama aldol反应组装而成。