New efficient synthesis of trisubstituted imidazolidine-2-thiones and thiazoles via vinyliminophosphoranes
作者:Hai Xie、Jian-Chao Liu、Lei Wu、Ming-Wu Ding
DOI:10.1016/j.tet.2012.07.002
日期:2012.9
Isothiocyanate 6, obtained from vinyliminophosphorane 4 with CS2, reacted with various aliphatic primary amines to afford directly the 1,4,5-trisubstituted imidazolidine-2-thiones 5. However, the reaction of isothiocyanate 6 with aliphatic secondary amines provided 2,4,5-trisubstituted thiazoles 10 in good yields.
由乙烯基亚氨基磷烷4与CS 2制备的异硫氰酸酯6与各种脂肪族伯胺反应,直接得到1,4,5-三取代的咪唑烷-2-硫酮5。然而,异硫氰酸酯6与脂族仲胺的反应以良好的产率提供了2,4,5-三取代的噻唑10。