Synthesis of C3-C12 Fragment of 24-Demethylbafilomycin C<sub>1</sub> via <i>anti</i>-Selective Aldol Condensation as the Key Stereocontrol Step
作者:Wei-Min Dai、Gaofeng Feng、Jinlong Wu、Liang Sun
DOI:10.1055/s-2008-1072504
日期:——
An efficient synthesis of the C3-C12 aldehyde fragment of 24-demethylbafilomycin C1 was accomplished for assembling the 16-membered plecomacrolide skeleton according to a 1,3-diene-ene ring-closing metathesis (RCM) strategy. A boron-mediated anti-selective aldol condensation of Abiko’s chiral propionate was used to secure the C6 and C7 stereogenic centers while the C8 chirality was introduced from a chiral building block. The dithiane alkylation and the methyl ketone Horner-Wittig olefination using allyldiphenylphosphine oxide were employed for construction of the requisite (E)-1,3-diene subunit.
根据1,3-二烯-烯环化复分解(RCM)策略,对24-去甲基巴夫洛霉素C1的C3-C12醛基片段进行了有效合成,以组装16元plecomacrolide骨架。采用硼介导的反选择性醛缩合反应对Abiko的手性丙酸酯进行C6和C7立体中心保护,同时从手性结构单元引入C8手性。利用烯丙基二苯基氧化膦进行二噻烷烷基化和甲基酮霍纳-维蒂格烯化反应,以构建所需的(E)-1,3-二烯亚基。