A short approach to the tetrahydrofuran fragment of amphidinolides X and Y has been developed through the combination of iterative Sharpless asymmetric epoxidations, Pd-catalyzed regioselective hydrogenolysis of a 4,5-epoxy-2-alkenoate and the disfavored 5-endo-tet ring closure of a β-hydroxy epoxide promoted by a double bond adjacent to the epoxide function.
A New Synthesis of Tetrahydrofuran Fragment of Amphidinolides X and Y
作者:Wei-Min Dai、Yile Chen、Jian Jin、Jinlong Wu
DOI:10.1055/s-2006-932487
日期:——
A new synthesis of the tetrasubstituted tetrahydrofuran fragment of the marine secondary metabolites amphidinolidesX and Y is described. The oxygenated chiral quaternary carbon was assembled by asymmetric dihydroxylation in high enantioselectivity and the tetrahydrofuran ring was constructed by an acid-catalyzed 5-endo ring-opening cyclization of the epoxide possessing a vinyl moiety.
描述了海洋次生代谢物 amphidinolides X 和 Y 的四取代四氢呋喃片段的新合成。氧化手性季碳是通过不对称二羟基化以高对映选择性组装的,四氢呋喃环是通过酸催化的具有乙烯基部分的环氧化物的 5-内开环环化来构建的。