Aldehyde 11 was prepared with >90% ds using a Sn(II)-mediated aldol reaction between (S)-13 and (S)-14. Conversion into the γ-pyrone 8, a known degradation product from dihydrosiphonarin B, established the absolute configuration as enantiomeric to that shown in 4.
使用(S)-13和(S)-14之间的Sn(II)介导的醛醇缩合反应,以大于90%的ds制备醛11。转化为
γ-吡喃酮8(一种已知的二氢虹吸蛋白B的降解产物)建立了与4中所示对映异构体的绝对构型。