Cyclization reaction of N-allylbenzothioamide for direct construction of thiazole and thiazoline

A facile catalyst-free intramolecular cyclization reaction of N-allylbenzothioamide was developed affording thiazoles and thiazolines as products with good chemical yields. This reaction provides a new access to 2,5-disubstituted thiazoles and thiazolines directly from readily available N-allylbenzothioamide.