Treatment of 4-chloro-5H-1,2,3-dithiazol-5-one with 3-alkyl (or aryl)-3-amino-2-propenoate esters in DMSO at 120°C gave the corresponding 2-thiocyanated esters 4 (major) and 5-alkoxycarbonyl-4-alkyl (or aryl)-4-thiazolin-2-ones 5 (minor), whereas the esters bearing a strong electron-withdrawing group at C-3 under the same conditions afforded 5 and/or 4-substituted 5-alkoxycarbonyl-2-aminothiazoles
在120°C下于
DMSO中用3-烷基(或芳基)-3-
氨基-2-
丙烯酸酯处理4-
氯-5 H -1,2,3-二
噻唑-5-酮,得到相应的2-
硫氰酸酯4(主要)和5-烷氧基羰基-4-烷基(或芳基)-
4-噻唑啉-2-酮5(次要),而在相同条件下在C-3带有强吸电子基团的酯得到5和/或4-取代的5-烷氧基羰基-
2-氨基噻唑6,取决于吸电子基团。