Staudinger reactions of unsymmetrical cyclic ketenes: a synthetically useful approach to spiro β-lactams and derivatives. Reaction mechanism and theoretical studiesElectronic supplementary information (ESI) available: Spectral data for compounds 4b–4m and 5b–5d and Cartesian coordinates and energies (hartrees) of zwitterionic intermediates (IZ1, IZ2, IZ3, and IZ4) and transition structures (TS1, TS2, TS3 and TS4). See http://www.rsc.org/suppdata/p1/b1/b103279h/
作者:Eduardo Alonso、Carlos del Pozo、Javier González
DOI:10.1039/b103279h
日期:2002.2.6
efficient and operationally simple synthesis of tetrahydrofuran-derived spiro-β-lactams using the ketene–imine cycloaddition route is described. Also the preparation of spiro-N-sulfonyl-β-lactam derivatives, which are analogs of monobactams, is reported. As far as we know, this is the first time that an unsymmetrical cyclic ketene is used in a Staudinger-type reaction. The experimental evidence suggests
高效且操作简单的合成四氢呋喃衍生的螺β-内酰胺。 烯酮–亚胺描述了环加成路线。还制备螺-N-磺酰基-β-内酰胺衍生物,它们是单bactams,据报道。据我们所知,这是第一次非对称循环烯酮用于施陶丁格型反应。实验证据表明烯酮 源自 酰氯反应中的前体。为了获得对控制反应的立体化学结果的电子效应的深入了解,已进行了从头算的高级从头计算。