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 subunit2 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