1,3-Thiazoline-5-thiolates and 1,3-Thiazole-5(2H)-thiones by [3+2]-Cycloaddition of Carbon Disulfide to Metalated 4-Alkylidene-4H-pyridin-1-ides
作者:Diana Hampe、Helmar Görls、Ernst Anders
DOI:10.1002/ejoc.200500373
日期:2005.11
two-step reaction which starts with a Cα CS2 coupling and continues with a ring closure reaction to yield lithium thiazolidine-5-thiones 2. A proton migration from the Cα position to the previous imino N-atom then follows to form the 2,3-dihydro-1,3-thiazole-5-thiolates 3a–e. Protonation of 3 and a final oxidation of the intermediates 6 results in the formation of 1,3-thiazole-5(2H)-thiones 7. This