Regioselective Electrophilic Substitution of 2-Hydroxy and 2-Methoxy Substituted Acridines. Application to the Synthesis of Pyrido[2,3,4-mn]acridine
作者:N. Fixler、M. Demeunynck、J. Lhomme
DOI:10.1080/00397919708003387
日期:1997.7
Abstract The presence of a hydroxy or methoxy group in position 2 of acridine directs the electrophilic substitution by formaldehyde in methane sulfonic acid to position 1. This reactivity is applied to the synthesis of pyrido[2,3,4-m,n]acridine.
and the Vilsmeier−Haack reaction. The reaction is fully regioselective and gives the corresponding 6-substituted derivatives. The pyrido[4,3,2-kl]acridin-4-one reacts with amines and thiol, via 1,4-Michael addition to give the 6-amino or 6-thio analogues in a very efficient way. Molecular calculations account for the observed regioselectivity.