Structure Investigations of (ent)-Cladospolide D by De Novo Synthesis and Kinetic and Thermodynamic Isomerization
作者:John Penn、George O’Doherty、Yalan Xing
DOI:10.1055/s-0029-1217606
日期:2009.9
dihydroxylation of a dienoate installed the remaining stereochemistry. The de novo asymmetric route allowed for the asymmetric synthesis of three members of the cladospolide natural products and correctly established the structure for cladospolide D. cladospolides B-D - asymmetric synthesis - natural product synthesis - E/Z-alkene isomerization
从非手性非1-炔实现了cladospolides B和C和(ent)-cladospolide D的从头不对称合成。11-13步的路线依赖于Noyori还原反应和KAPA促进的炔烃拉链反应,以跨越九个碳原子片段传递非手性官能团并实现二烯酸官能团的安装。二烯酸酯的非对映选择性和区域选择性Sharpless二羟基化反应可保留剩余的立体化学。从头不对称路线允许克拉多波德天然产物的三个成员的不对称合成,并正确建立了克拉多波德D的结构。 cladospolides BD-不对称合成-天然产物合成-E / Z-烯烃异构化