作者:D.Jonathan Bennett、Alexander J Blake、Paul A Cooke、Christopher R.A Godfrey、Paula L Pickering、Nigel S Simpkins、Matthew D Walker、Claire Wilson
DOI:10.1016/j.tet.2004.01.100
日期:2004.5
A range of reactions of cyclic lactam systems is described in which an atropisomeric C-N axis controls the stereochemical outcome of ring substitution or addition. In the case of enantiopure menthol adducts, substitution via N-acyliminium intermediates occurred with essentially complete control. However, the range of nucleophiles that participate in the reaction is very limited and at present the removal of the N-aryl substituent is problematic. A six-membered enamide is of moderate configurational stability and the axis exerts synthetically useful levels of control over enolate alkylations of the system. A novel Lewis acid mediated enamide arylation process was identified. (C) 2004 Elsevier Ltd. All rights reserved.