2-Aminothiophene-3-carboxamides are converted to oxamates or fumaramides by acylation of the amino group. Cyclization yields thieno[2,3-d]pyrimidines which may also be prepared from the corresponding oxazines. Compounds illustrative of those having inhibitory action on the immediate hypersensitivity reaction in mammals are N-[3-(aminocarbonyl)-4,5,6,7-tetrahydrobenzo[b]thien-2-yl]oxamic acid, ethyl 5,6,7,8-tetrahydro-4-oxo-4H-benzothieno[2,3-d][1,3]oxazine-2-carboxylate, and ethyl 3,4-dihydro-6-ethyl-4-oxothieno[2,3-d]pyrimidine-2-carboxylate.
2-
氨基
噻吩-3-羧酰胺经
氨基乙酰化反应转化为草酰胺或富马酰胺。环化反应得到
噻吩[2,3-d]
嘧啶,该化合物也可以由相应的
噻吩氧杂环制备而成。具有对哺乳动物的即时超敏反应抑制作用的化合物包括N-[3-(
氨基甲酰基)-4,5,6,7-四氢苯并[b]
噻吩-2-基]
草酸、
乙酸乙酯5,6,7,8-四氢-4-氧代-4H-
苯并噻吩[2,3-d][1,3]
噁唑-2-
羧酸乙酯和
乙酸乙酯3,4-二氢-6-乙基-4-氧代
噻吩[2,3-d]
嘧啶-2-
羧酸乙酯。