PyrrolidineN-Oxides by Stereoselective Addition of Grignard and Lithium Compounds to 4,5-Dideoxy-2,3-O-isopropylidene-D-erythro-4-pentenoseN-Benzyl Nitrone and Subsequent Cope−House Cyclization
作者:Andreas M. Palmer、Volker Jäger
DOI:10.1002/1099-0690(200104)2001:7<1293::aid-ejoc1293>3.0.co;2-4
日期:2001.4
accessible from D-ribose, furnishes ω-unsaturated hydroxylamines that readily undergo Cope−House cyclization to afford pyrrolidine N-oxides. The stereoselectivity of the addition step is altered by either employing organolithium compounds or Lewis acids as complexing agents. The pyrrolidine N-oxides obtained by this sequence serve as key intermediates in the synthesis of 2,5-disubstituted pyrrolidine-3
将格氏试剂添加到 D-erythro-4-pentenose N-benzyl nitone 5,它很容易从 D-核糖中获得,提供 ω-不饱和羟胺,容易进行 Cope-House 环化,得到吡咯烷 N-氧化物。通过使用有机锂化合物或路易斯酸作为络合剂来改变加成步骤的立体选择性。通过该序列获得的吡咯烷 N-氧化物是合成 2,5-二取代吡咯烷-3,4-二醇(将单独详细讨论)的关键中间体,两者均构成新的潜在糖苷酶抑制剂。