A two step synthesis of dihydrothiazoles is presented. First, the previously unknown N-propargylic dithiocarboimidates are produced in good yields from easily available, cheap starting materials. The subsequent gold catalysed ring closure is fast and efficient, leading to dihydrothiazoles through a cascade of 5-exo-dig cyclisation and 1,3-alkyl migration. The yields range from 74% to 95%.
本文介绍了一种二氢
噻唑的两步合成方法。首先,利用易得、价廉的起始原料,高效地合成了先前未知的N-
丙炔基二
硫代羰基
亚胺酯。接着,通过
金催化的环合反应快速高效地完成了闭环,通过5-外向双环化及1,3-烷基迁移的级联过程得到二氢
噻唑,产率在74%至95%之间。