Thiophene ring-opening reactions II. Easy synthesis of 1,3,4-thiadiazoline-sulfanylpyridazine hybrids
作者:Ahmad H. Abdullah、Mustafa M. El-Abadelah、Jalal A. Zahra、Salim S. Sabri、Firas F. Awwadi
DOI:10.1007/s00706-021-02798-4
日期:2021.7
1-aryl-6-chloro-5-nitro-4-oxothieno[2,3-c]pyridazine-3-carboxylic ester, in the presence of triethylamine, proceeded via a thiophene ring-opening process and furnished, upon addition of iodomethane or allyl bromide, the respective 6-(methyl/allylthio)-4-oxopyridazine-1,3,4-thiadiazoline hybrids. Acid-catalyzed hydrolysis of the latter esters yielded the corresponding carboxylic acids. The new compounds were characterized
的反应N' -arylbenzothiohydrazides与1-芳基-6-氯-5-硝基-4-氧代噻吩并[2,3- c ^ ]哒嗪-3-羧酸酯,在三乙胺的存在下,通过噻吩开环进行过程并在添加碘甲烷或烯丙基溴后提供相应的 6-(甲基/烯丙基硫基)-4-氧代哒嗪-1,3,4-噻二唑啉杂化物。后一种酯的酸催化水解产生相应的羧酸。新化合物通过 IR、HRMS 和 NMR 光谱数据进行表征,4-氧代哒嗪-噻二唑啉结构由 X 射线晶体学证实,用于该组的代表性混合物。 图形摘要