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.