were prepared from 4-chlorocoumarin and α-aminoacid derivatives. Their reaction with organometallic compounds (RLi or RMgBr) and subsequent cyclization of ketones thus obtained, give [1]benzopyrano[4,3-b]pyrrol-4(1H)-ones. Starting from proline derivatives, simultaneously with the pyranone-pyrrole fusion, we establish an interesting procedure for the formation of pyrrolizines.
由4-
氯香豆素和
α-氨基酸衍
生物制得N(α)-(2-Oxo-2 H -1-苯并
吡喃-4-基)Weinreb-α-
氨基酰胺。它们与有机
金属化合物(RLi或RMgBr)反应,然后将如此得到的酮环化,得到[1]苯并
吡喃并[4,3 - b ]
吡咯-4(1 H)-。从脯
氨酸衍
生物开始,与
吡喃酮-
吡咯融合同时,我们建立了一个有趣的过程,用于形成
吡咯嗪。