作者:Andreas S. Kalogirou、Panayiotis A. Koutentis
DOI:10.1016/j.tet.2009.06.086
日期:2009.8
4,5-Dichloro-1,2,3-dithiazolium chloride 1 (Appel salt) reacts in wet DCM, THF or MeCN to give elemental sulfur, dithiazole-5-thione 4, dithiazol-5-one 5 and thiazol-5-one 6. Furthermore the reaction of 2-phenylthiazol-5(4H)-one 12 with Appel salt 1 at ca. 20 degrees C gives 4-(4-chloro-5H-1,2,3-dithiazol-5-ylidene)-2-phenylthiazol-5(4H)-one 13 (26%) while at ca. 82 degrees C a new product 2,2'-diphenyl-4,4'-bithiazol-ylidene-5,5'-dione 14 (36%) is additionally isolated. Finally, 4,4'-bithiazolylidene-5,5'-dione 14 is prepared directly by treating 2-phenylthiazol-5(4H)-one 12 with N-chlorosuccinimide. All new Compounds are fully characterised and rational mechanisms are proposed for the formation of all key compounds. (C) 2009 Elsevier Ltd. All rights reserved.