rhodanine. Under the action of NaOH, the prepared pyrazole-3-carboxylates underwent recyclization to form 2-aryl-7-oxo-2,7-dihydrothiopyrano[3,4-c]pyrazole-5-carboxylic acids—the first representatives of new heterocyclic system.
摘要结果获得了一系列的4-[(Z)-(4-氧代-2-
硫代氧代-1,3-
噻唑烷-5-亚甲基)甲基] -1-芳基-1 H-
吡唑-3-
羧酸乙酯4-甲酰基-1-芳基-1 H-
吡唑-3-
羧酸乙酯与若丹宁的反应 在NaOH的作用下,制得的
吡唑-3-
羧酸酯经过再循环形成2-芳基-7-氧代-2,7-二氢
硫代
吡喃并[3,4- c ]
吡唑-5-羧酸,这是新杂环的第一个代表系统。