Fused Thiazoles from 3-Amino-2-thioxo-2,3-dihydrothiazoles: Synthesis of Mesoionic Thiazolo[2,3-<i>b</i>]-1,3,4-thiadiazoles and 2,3-Dihydro-4<i>H</i>-thiazolo[2,3-<i>b</i>][1,3,4]thiadiazin-5-ium Derivatives
作者:P. Molina、A. Arques、M. D. Velasco、J. M. Villalgordo
DOI:10.1055/s-1988-27691
日期:——
A number of mesoionic compounds 4 (5-phenylthiazolo [2,3-b]-1,3,4-thiadiazolium-2-arylaminides), derivatives of the thiazolo[2,3-b]-1,3,4-thiadiazole ring system, have been prepared from 3-amino-2-benzylthio-4-phenylthiazolium cation 2 and aryl isothiocyanates in the presence of triethylamine. Aldimine 5 reacts with phenacyl bromides under mild conditions to give 2,3-dihydro-4H-thiazolo [2,3-b][1,3,4]thiadiazin-5-ium bromides 7.
在三乙胺存在下,由 3-氨基-2-苄硫基-4-苯基噻唑阳离子 2 和芳基异硫氰酸酯制备出了一些介离子化合物 4(5-苯基噻唑并[2,3-b]-1,3,4-噻二唑鎓-2-芳基氨基化物),它们是噻唑并[2,3-b]-1,3,4-噻二唑环系统的衍生物。在温和的条件下,醛亚胺 5 与苯基溴化物发生反应,生成 2,3-二氢-4H-噻唑并 [2,3-b][1,3,4]噻二嗪-5-鎓溴化物 7。