[structure: see text] A convergent total synthesis of khafrefungin was accomplished on the basis of (1) the highly stereoselective TiCl4-mediated vinylogous Mukaiyama aldol reaction using vinylketene silyl N,O-acetal and (2) syn-selective aldol reaction of enal 5a and ethyl ketone 6 followed by anti-dehydration under Mitsunobu conditions.
[结构:见正文]在以下条件下完成了卡夫丁净的聚合全合成:(1)使用
乙烯基烯酮甲
硅烷基N,O-
乙缩醛的高度立体选择性TiCl4介导的
乙烯基Mukaiyama醛醇缩合反应和(2)烯醛的顺选择性醛醇缩合反应5a和乙基酮6随后在Mitsunobu条件下抗脱
水。