Aza Wittig-type reaction between the iminophosphorane derived from 3-amino-4-phenylthiazole-2(3H)-thione and iso(thio)cyanates: Preparation of mesoionic thiazolo[2,3-b]-1,3,4-thiadiazoles and N,N-bisheteroarylamines
作者:Pedro Molina、Antonio Arques、Asunción Alías
DOI:10.1016/s0040-4020(01)90791-4
日期:1992.1
of iminophosphorane 1 derivedfrom 3-amino-4-phenylthiazole-2(3H)-thione with several types of iso(thio)cyanates has been studied. The reaction of 1 with aromatic iso(thio)cyanates leads to thiazolo[2,3-b]-1,3,4-thiadiazoles 2 which display mesoionic character, whereas that with aliphatic isothiocyanates affords the betaines 3. N,N′-Bisheteroarylguanidines 5 are obtained from the reaction of 1 with