作者:Ivo C. Ivanov、Lyubomir D. Raev
DOI:10.1002/ardp.19953280110
日期:——
Addition of the enaminoesters 2a–d to the 6‐nitrocoumarins 1a–d gave 3 or 5. The aminocrotonic esters 2a,b underwent competitive addition of their C‐4‐methyl groups to yield 6a,b as by‐products. Benzopyrano[3,4‐c]pyridine derivatives 4b and 7–9 have been obtained from the adducts under various conditions. Some of the adducts have been converted by acidic hydrolysis into the amides 10 which have also
将烯氨基酯 2a - d 添加到 6-硝基香豆素 1a - d 中得到 3 或 5。氨基巴豆酸酯 2a、b 竞争性加成其 C - 4 - 甲基,得到 6a、b 作为副产物。苯并吡喃 [3,4-c] 吡啶衍生物 4b 和 7-9 已在各种条件下从加合物中获得。一些加合物已通过酸性水解转化为酰胺 10,酰胺 10 也可通过将丙二酸乙酯添加到 1b-d 中直接制备。