Synthesis of [1]benzopyrano[4,3-b]pyrrol-4(1H)-ones from N(α)-(2-oxo-2H-1-benzopyran-4-yl)weinreb α-aminoamides
作者:Angel Alberola、Rocío Álvaro、Alfonso González Ortega、M.Luisa Sádaba、M Carmen Sañudo
DOI:10.1016/s0040-4020(99)00802-9
日期:1999.11
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。