The reaction of racemic γ-substituted α,β-unsaturated γ-lactams rac-1 with arylboron reagents 2 in the presence of a chiral diene L1a–rhodium catalyst under basic conditions (3.0 equiv of NEt3) gave high yields of β,γ-disubstituted trans-γ-lactams 3 with both high diastereo- and enantioselectivity. Fast racemization of 1 by way of a dienolate generated with the base followed by kinetic resolution of
作者:A. Yu. Egorova、V. A. Sedavkina、Z. Yu. Timofeeva
DOI:10.1023/a:1011644202879
日期:——
Kugel, Justus Liebigs Annalen der Chemie, 1898, vol. 299, p. 63,64
作者:Kugel
DOI:——
日期:——
One‐Pot Synthesis of Ene‐Lactams via<i>N</i>‐Debenzylation of Keto‐Containing<i>N</i>‐2,4‐Dimethoxylbenzylamides
作者:Wai Ming Kan、Ching‐Lung Cheng、Ching‐Yuh Chern
DOI:10.1081/scc-200039335
日期:2004.12.31
A general method of ene-lactam preparation is described. Ene-lactams can be prepared efficiently from keto-containing N-2,4-dimethoxylbenzylamides in good to excellent yields. This method is applicable for the preparation of substituted delta-, gamma-. and epsilon-ene-lactams and bicyclic ene-lactams.