Direct Transacylation of 2,2,2-Trihaloethyl Esters with Amines and Alcohols Using Phosphorus(III) Reagents for Reductive Fragmentation and in Situ Activation
作者:Jeremy J. Hans、Russell W. Driver、Steven D. Burke
DOI:10.1021/jo991711m
日期:2000.4.1
reductants, with resultant carboxylate activation as an acyloxyphosphonium intermediate, and in situ trapping by amine or alcohol nucleophiles. Secondary and tertiary amides were synthesized, including a dipeptide, in good yields using hexamethylphosphorous triamide (Me2N)3P, as reducing agent. Optimal yields of esters derived from primary and secondary alcohols were obtained using tributylphosphine
酰胺和酯是由一锅中的2,2,2-三卤代乙基酯使用磷-(III)试剂作为还原剂合成的,所得羧酸盐被活化为酰氧基phosph中间体,并通过胺或醇亲核试剂原位捕集。使用六甲基亚磷酸三酰胺(Me2N)3P作为还原剂,可以高收率合成仲酰胺和叔酰胺,包括二肽。使用三丁基膦和DMAP可获得来自伯醇和仲醇的酯的最佳收率。三溴乙基酯提供的收率优于三氯乙基酯获得的收率。