described. Compound 5a was deacylated upon treatment with sodium hydroxide followed by hydrochloric acid to give 7,8-dimethoxy-2,3-dihydrobenzo[f][1,2]thiazepine-1,1-dioxide-4 (5H)-one 8 and its N-ethyl derivative transferred to 6,7-dimethoxy-2-ethyl-3-oxo-3,4-dihydrobenzo[e][1,2]thiazine-1,1-dioxide 7 by the reaction with ethyl methyl ketone in the presence of pyrrolidine.
摘要 新型 2-(6,7-dimethoxy-3-oxo-3,4-dihydrobenzo[e][1,2]thiazine-1,1-dioxide-2-yl)
乙酸乙酯 3a 的醇盐促进扩环和类似的 4,4-
二乙基衍
生物 3b 以及 2-[2-(苯基
氨基羰基甲基
氨磺酰基)-4,5-二
甲氧基苯基]
乙酸甲酯 9 环化为 7,8-二甲氧基-4 的相应新 3-
羧酸酯和 3-甲酰
苯胺-hydroxy-2,5-dihydrobenzo[f][1,2]thiazepine-1,1-dioxide(分别为 5a、b 和 10)被描述。化合物 5a 在用
氢氧化钠和
盐酸处理后脱酰化,得到 7,8-二甲氧基-2,3-二氢苯并[f][1,2]thiazepine-1,1-dioxide-4 (5H)-one 8 和其 N-乙基衍
生物通过与乙基甲基酮反应转移到 6,7-二甲氧基-2-乙基-3-氧代-3,4-二氢苯并[e][1