O-(2-Oxopyrrolidin-5-yl)trichloroacetimidates as Amidoalkylating Agents − Synthesis of (+)-Lentiginosine
作者:Ahmed O. H. El-Nezhawy、Hoda I. El-Diwani、Richard R. Schmidt
DOI:10.1002/1099-0690(200212)2002:24<4137::aid-ejoc4137>3.0.co;2-x
日期:2002.12
N-α-Hydroxyalkylamides 6a,b, readily available from L-tartrate, with trichloroacetonitrile furnish O-(2-oxopyrrolidin-5-yl)trichloroacetimidates 3a,b. α-Amido-alkylation studies of 3a,b with allyl-trimethylsilane and electron-rich benzene derivatives as C-nucleophiles afforded 5-allyl- and 5-aryl-2-pyrrolidinones 2a,b, 7a,b, and 8−10. The target compound (+)-1 and its epimer 15 were readily obtained
N-α-羟基烷基酰胺 6a,b,容易从 L-酒石酸盐获得,与三氯乙腈一起提供 O-(2-氧代吡咯烷-5-基)三氯乙酰亚胺酯 3a,b。使用烯丙基-三甲基硅烷和富电子苯衍生物作为 C-亲核试剂对 3a,b 进行 α-酰胺基烷基化研究,得到 5-烯丙基-和 5-芳基-2-吡咯烷酮 2a,b、7a、b 和 8-10。目标化合物 (+)-1 及其差向异构体 15 分别由 1,5-二烯丙基-2-吡咯烷酮 2b 和 7b 通过闭环复分解、酰胺基团还原和 CC-双键氢化反应得到。(© Wiley-VCH Verlag GmbH & Co KGaA, 69451 Weinheim, Germany, 2002)