Substitution effects in intramolecular aziridine–allylsilane cyclizations
摘要:
We report here the synthesis of an aziridine tethered to a substituted allylsilane via a substituted tether. These tether-substituted aziridine-allylsilanes cyclize differently upon treatment with BF3.OEt2 than tether-unsubstituted aziridine-allylsilanes and provide a 6-endo-type product. We show that steric interactions between the N-substituent of the aziridine and substitution on the tether can control the product distribution. (C) 2008 Elsevier Ltd. All rights reserved.
Stereo- and regioselective routes to allylic silanes
作者:Ei-ichi Negishi、Fen-Tair Luo、Cynthia L. Rand
DOI:10.1016/s0040-4039(00)97523-3
日期:1982.1
Synthetic Access to Bent Polycycles by Cation-π Cyclization
作者:Ryan A. Shenvi、E. J. Corey
DOI:10.1021/ol101410g
日期:2010.8.6
The presence of an ether oxygen within a chain undergoing cation-polyene cyclization has a profound Influence on the stereochemistry of this important construction, apparently due to nucleophilic participation of oxygen in the cyclization process and formation of an oxonium intermediate, leading to bent fused ring systems.