Synthesis of N-(4-arylmethylene-Δ<sup>2</sup>-oxazolin-5-ylidene)ammonium salts and their conversion into 5-imino-Δ<sup>2</sup>-oxazolines and 1,3-diazafulvenes
作者:G. V. Boyd、P. H. Wright
DOI:10.1039/p19720001140
日期:——
secondary or tertiary amides of α-benzamidocinnamic acids with acetic anhydride–perchloric acid gave N-(4-arylmethylene-2-phenyl-Δ2-oxazolin-5-ylidene)ammonium perchlorates. The N-monosubstituted iminium salts were deprotonated to yield the corresponding 4-arylmethylene-5-imino-Δ2-oxazolines; successive treatment of two NN-disubstituted iminium perchlorates with ammonia and sodium hydroxide produced novel
A facile and effective synthesis for a wide variety of 4-arylidene-5-imidazolinone derivatives was developed. 4-Arylidene-5-oxazolinones were prepared by Erlenmeyer azlactone synthesis from N-acylglycines and arylaldehydes. The ring-opening reactions of the 4-arylidene-5-oxazolinones with primary amines afforded 2-acylamino-3-arylacrylamides in excellent yields. A new dehydrative cyclization of the