N- andO-Methyl Derivatives of 2,3,5,10-Tetrahydrobenzo[g]isoquinoline-3,5,10-triones
作者:Boufelja Bouammali、Félix Pautet、Silène Carneiro Do Nascimento、Michèle Boitard、Houda Fillion
DOI:10.1002/ardp.19933260910
日期:——
by a Diels‐Alder reaction between different 2‐azadienes 1 and 1,4‐naphthoquinone. The corresponding N‐ and O‐methyl derivatives 3 and 4 respectively were obtained by the use of CH3I in a basic medium: triethylamine (method A), K2CO3 and tris[2‐(2‐methoxyethoxy)ethylamine] (method B) or in the presence of Ag2O. The reaction of N‐methylation was regiospecific, while the O‐methylation was regioselective