申请人:Mead Johnson & Company
公开号:US04234581A1
公开(公告)日:1980-11-18
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-羧酰胺可通过氨基基团的酰化反应转化为草酰胺或富马酰胺。环化反应可得到噻吩[2,3-d]嘧啶,该反应也可从相应的噻吩氧杂环化合物制备。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]氧杂环戊酸乙酯以及乙酸乙酯3,4-二氢-6-乙基-4-氧代噻吩[2,3-d]嘧啶-2-羧酸乙酯。