Diastereoselective Synthesis of Bicyclic γ-Lactams via Ring Expansion of Monocyclic β-Lactams
作者:Stijn Dekeukeleire、Matthias D’hooghe、Norbert De Kimpe
DOI:10.1021/jo802459j
日期:2009.2.20
with 1 equiv of AgBF4 and pyridine in toluene via intramolecular nucleophilic trapping of N-acyliminium intermediates by the hydroxyl moiety. Additionally, the corresponding aza-analogues of the aforementioned bicyclic γ-lactams (i.e., trans-1,4-diazabicyclo[3.3.0]octan-8-ones and trans-1,5-diazabicyclo[4.3.0]nonan-9-ones) were prepared in a convenient way starting from cis-4-(1-chloro-1-methylethyl