amines and alcohols to give immobilized acyl, amide and ester ylides, respectively. Their Wittig reactions lead to alkenes free of phosphane oxide. Optically pure 5-substituted tetramates were obtained from reactions of resin-bound Ph3PCCO with alpha-ammonium esters in one step. The mycotoxin (-)-tenuazonic acid was accordingly prepared in just three steps.
分两步大规模制备了聚
苯乙烯结合的累积叶立德Ph3
PCCO。它与格利雅化合物,胺和醇反应,分别得到固定的酰基,酰胺和酯基。它们的维蒂希反应生成不含氧化膦的烯烃。从
树脂结合的Ph3
PCCO与α-
铵酯的一步反应中获得光学纯的5-取代的
四酸酯。相应地,分三步制备了霉菌毒素(-)-tenuazonic酸。