Synthesis of the C1–C12 acid fragment of amphidinolide T marine macrolides via SmI2-mediated enantioselective reductive coupling of aldehydes with a chiral crotonate
作者:Jialu Luo、Huoming Li、Jinlong Wu、Xinglong Xing、Wei-Min Dai
DOI:10.1016/j.tet.2009.06.070
日期:2009.8
A new strategy for enantioselective assembly of the trisubstituted tetrahydrofuran ring has been established for synthesis of the C1–C12 acid fragment of amphidinolide T series marine macrolides. The key steps involve the SmI2-mediated highly enantioselective reductive coupling of an aldehyde with the (1S,2R)-N-methylephedrine-derived crotonate to form the cis-3,4-disubstituted γ-butyrolactone and the
已经建立了三取代四氢呋喃环对映选择性组装的新策略,用于合成两性霉素T系列海洋大环内酯的C1-C12酸片段。关键步骤涉及醛与(1 S,2 R)-N-甲基麻黄碱衍生的巴豆酸酯的SmI 2介导的高对映选择性还原偶联,形成顺式-3,4-二取代的γ-丁内酯和随后的BF 3五元环氧碳鎓离子与烯丙基三甲基硅烷介导的1,3-抗选择性烯丙基化。所需的C1-C12酸片段通过9步序列以> 25%的总收率获得。