Studies of heterocyclic compounds. VII. The reactions of 5,6-dihydrothiazolo(2,3-b)thiazolium salts with carbanions.
作者:HIROKO OHTSUKA、TADASHI MIYASAKA、KIICHI ARAKAWA
DOI:10.1248/cpb.23.3254
日期:——
The reaction of 5, 6-dihydrothiazolo [2, 3-b] thiazolium salt (1) with the sodium salt of acetylacetone furnished 3-(2-thiazolyl)-acetylacetone (2) with elimination of thiirane and 2-acetonylidene-3-acetylthioethyl-4-thiazoline (3). The reaction of 1 with the sodium salt of ethyl acetoacetate gave ethyl 2-(2-thiazolyl)-acetoacetate (12) and the reaction of 1 with the sodium salts of ethyl cyanoacetate and malononitrile gave 2-substituted thiazole (16), 3-(2-mercaptoethyl)-thiazoline (17) and/or its disulfide (18). The tautomeric forms of 2, 12 and 16 are discussed on the basis of the structures of the methylated products and of their spectrophotometric properties.
5,6-二氢噻唑并[2,3-b]噻唑盐(1)与乙酰乙酸钠反应,生成3-(2-噻唑基)乙酰乙酸(2),同时脱去硫杂环丙烷和2-丙酮亚甲基-3-乙酰硫乙基-4-噻唑啉(3)。1与乙酰乙酸乙酯钠盐反应得到乙基2-(2-噻唑基)乙酰乙酸酯(12),而1与氰乙酸乙酯钠盐和丙二腈钠盐反应则生成2-取代噻唑(16)、3-(2-巯基乙基)噻唑啉(17)及其二硫化物(18)。根据甲基化产物的结构及其分光光度特性,讨论了2、12和16的互变异构形式。