2-(4-diazo-3-oxoalkyl)pyridines (2), 4-alkoxycarbonyl (or 4-acyl)-3-oxo-1,2,3,4-tetrahydroquinolizinium ylides (3) were obtained in high yields. From the cycloaddition reaction of 3 with acetylenic esters (propynoates or acetylenedicarboxylates) the labile [2 + 3] cycloadducts, 3-oxo-3H-2a,4,5,8a-tetrahydropyrrolo[2,1,5-de]quinolizine-2a-carboxylates (8 or 12), were identified, which further reacted with DMAD
通过
铜(II)催化的2-(4-重氮-3-氧代烷基)
吡啶(2),4-烷氧基羰基(或4-酰基)-3-氧代
1,2,3,4-四氢喹啉基亚基(3)以高收率获得。从3与炔属酸酯(
丙酸酯或炔二
羧酸酯)的环加成反应中,不稳定的[2 + 3]环加合物,3-oxo-3H-2a,4、5、8a-
四氢吡咯并[2,1,5-de]喹诺嗪-2a鉴定了α-
羧酸盐(8或12),其进一步与
DMAD(
乙炔二
羧酸二甲酯)反应,得到偶氮碱衍
生物(15或16),并通过脱氧羰基羰基化反应生成
吡咯二氢
喹啉(9或20)。