Phosphorus in organic synthesis. Acyloxyphosphonium salts as chemoselective acylating reagents
作者:Paul Frøyen
DOI:10.1016/s0040-4039(97)01172-6
日期:1997.7
Acyloxytriphenylphosphonium salts 1 prepared in situ react with a variety of aminophenols to give the corresponding amides in excellent yields. At −25° N-acylated products are formed exclusively, whereas at 0° some O-acylated products are observed. 1 is also a convenient trifluoroacetylating reagent.