Reinvestigation of 1,3,4-Thiadiazol-2(3H)-iminium Bromide in the Two-Step Synthesis of Imidazo[2,1-b][1,3,4]thiadiazoles
作者:Shigeki Sano、Keisuke Matsuura、Hayato Sumiyoshi、Akira Miki、Syuji Kitaike、Michiyasu Nakao
DOI:10.3987/com-14-12938
日期:——
The synthesis of 1,3,4-thiadiazol-2(3H)-iminium bromides, which are intermediates in the most commonly used synthetic approach to imidazo [2,1-b] [1,3,4]thiadiazoles, and a single crystal X-ray diffraction study of one of these iminium bromides are described. Cyclization of the resulting 1,3,4-thiadiazol-2(3H)-iminium bromides under microwave irradiation afforded imidazo [2,1-b] [1,3,4]thiadiazoles in 80-100% yields.