Studies of heterocyclic compounds. V. Synthesis of 5,6-dihydrothiazolo(2,3-b)thiazolium salts and their reactions with amines. A new synthesis of 2-aminothiazoles.
作者:HIROKO OHTSUKA、HATSUNORI TOYOFUKU、TADASHI MIYASAKA、KIICHI ARAKAWA
DOI:10.1248/cpb.23.3234
日期:——
5, 6-Dihydrothiazolo [2, 3-b] thiazolium salts (1a-d) were synthesized from 2-mercapto-thiazoline and α-haloketones. The reaction of 1 with a secondary amine gave 2-aminothiazole (7a-1) with the liberation of thiirane (9) via an unstable adduct, 7a-amino-2, 3, 5, 6-tetrahydrothiazolo [2, 3-b] thiazole (8a-g). The reaction of 1 with a primary amine afforded 3-(2-mercaptoethyl)-4-thiazolin-2-imine (10) and/or its disulfide (11). The reaction of 1 with an amine was concluded to be initiated by the attack of the reagent on C-7a.
5, 6-二氢噻唑 [2, 3-b] 噻唑鎓盐(1a-d)是通过2-巯基噻唑啉和α-卤酮合成的。1与二级胺的反应生成了2-氨基噻唑(7a-1),同时通过不稳定的加合物7a-氨基-2, 3, 5, 6-四氢噻唑 [2, 3-b] 噻唑(8a-g)释放出噻烷(9)。1与一级胺的反应产生了3-(2-巯基乙基)-4-噻唑啉-2-亚胺(10)和/或其二硫化物(11)。关于1与胺的反应,结论是反应的起始是由于试剂对C-7a的攻击。