Studies on Fungicides. XXIV. Reaction of 5-Methoxycarbonylmethylidene-2-thioxo (or oxo)-4-thiazolidones with o-Aminobenzenethiol and Other Thiols
作者:HIROSHI NAGASE
DOI:10.1248/cpb.22.42
日期:——
By a novel addition reaction of o-aminobenzenethiol to 5-methoxycarbonylmethylidene-2-thioxo (or oxo)-4-thiazolidones (I) were obtained 5-(3-oxo-2, 3-dihydro-4H-1, 4-benzothiazin-2-yl)-2-thioxo (or oxo)-4-thiazolidones (III). I was also found to reat with thiols to afford 1 : 1 adducts (II and VI) in the presence of a catalytic amount of triethylamine. Thermal cyclization of the adducts (II) to III was observed. The adducts (VI) were proved to dissociate into I and thiols when heated above their melting points or dissolved in acetone or ethanol. Oxidation of III and VI gave the dehydro-compounds (IV and VIII), respectively.
通过邻氨基苯硫酚与 5-甲氧羰基亚甲基-2-硫酮(或氧代)-4-噻唑烷酮(I)的新型加成反应,得到了 5-(3-氧代-2, 3-二氢-4H-1, 4-苯并噻嗪-2-基)-2-硫酮(或氧代)-4-噻唑烷酮(III)。在一定量的三乙胺催化下,I 还能与硫醇发生反应,生成 1 : 1 的加合物(II 和 VI)。观察到加合物(II)经热环化生成 III。事实证明,加合物(VI)在加热到熔点以上或溶解在丙酮或乙醇中时,会解离成 I 和硫醇。III 和 VI 氧化后分别生成脱氢化合物(IV 和 VIII)。