The synthesis of several imidazo[4,5-<i>d</i>]isothiazoles. Derivatives of a new ring system
作者:Eric E. Swayze、Leroy B. Townsend
DOI:10.1002/jhet.5570300533
日期:1993.10
the new imidazo[4,5-d]isothiazole ring system have been synthesized from the appropriately substituted isothiazolediamines. The reaction of 3-methyl-4,5-diaminoisothiazole (4a) with diethoxy-methyl acetate gave a low yield of 3-methylimidazo[4,5-d]isothiazole (5a). However, the analogous reaction of 4,5-diaminoisothiazole (4b) with diethoxymethyl acetate failed to yield the parent imidazo[4,5-d]isothiazole
从适当取代的异噻唑二胺合成了新的咪唑并[4,5- d ]异噻唑环系的几种衍生物。3-甲基-4,5-二氨基异噻唑(4a)与二乙氧基乙酸甲酯的反应产生了低产率的3-甲基咪唑并[4,5- d ]异噻唑(5a)。然而,4,5-二氨基异噻唑(4b)与二乙氧基甲基乙酸酯的类似反应未能产生母体咪唑并[4,5- d ]异噻唑环系统。二胺4a和4b易于与硫代羰基二咪唑环合,得到不稳定的硫酮6a和6b,它们被烷基化了原位得到相应的5-甲基硫代咪唑并[4,5- d ]异噻唑7a和7b的良好产率。通过用阮内镍处理,这些化合物都不能还原为相应的5-未取代的衍生物。据我们所知,这是咪唑并[4,5- d ]异噻唑环系统的首次报道。