1-morpholino-1,3-butadiene afforded dimethyl pyridazine-3,6-dicarboxylate as the major product. The tricyclic products underwent selective thermal decomposition to give dimethyl 4-methylpyridazine-3,6-dicarboxylate in excellent yield. The proposed mechanism of the formation as well as of the decomposition was supported by quantum chemical calculations and experimental evidence. (© Wiley-VCH Verlag GmbH
1-
氨基-
2-甲基-1,3-戊二烯用
1,2,4,5-四嗪-3,6-二
甲酸二甲酯处理得到二氮杂
三环[2.2.2.0]
辛烯和
4-甲基哒嗪-3,6二甲酯-二
羧酸盐,产物分布很大程度上取决于
氨基取代基的性质。在类似的条件下,类似的 1-morpholino-
1,3-丁二烯得到作为主要产物的
哒嗪-3,6-二
甲酸二甲酯。
三环产物经过选择性热分解,以优异的收率得到
4-甲基哒嗪-3,6-二
羧酸二甲酯。所提出的形成和分解机制得到了量子
化学计算和实验证据的支持。(© Wiley-
VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)