A new dioxopyrroline, 4, 5-diethoxycarbonyl-1H-pyrrole-2, 3-dione (3), was proved to be a strong dienophile in the Diels-Alder reaction with various butadienes. This cycloaddition reaction proceeded in a regio- and stereo-selective manner to give the polyfunctionalized hydroindoles (4-8, 10) which may be potential synthetic intermediates of Erythrina alkaloids.
新发现的二氧
吡咯啉,即4, 5-二乙氧羰基-1H-
吡咯-2, 3-二酮(3),在Diels-Alder反应中被证实是一种强有力的二烯亲和体,能与多种
丁二烯进行反应。这种环加成反应以区域和立体选择性的方式进行,生成多官能化的氢
吲哚(4-8, 10),这些化合物可能成为刺桐
生物碱的潜在合成中间体。