Process for preparing 2(1H)-quinazolinone derivatives
申请人:Sumitomo Chemical Company, Limited
公开号:US04387223A1
公开(公告)日:1983-06-07
2(1H)-Quinazolinone and quinazolinethione derivatives having excellent pharmacological activities are produced in high yield with high purity by heating the corresponding 3,4-dihydro-2(1H)-quinazolinone or quinazolinethione derivatives together with sulfur in an inert solvent.
Process for preparing 3,4-dihydro-2(1H)-quinazolinone derivatives
申请人:Sumitomo Chemical Company, Limited
公开号:US04202974A1
公开(公告)日:1980-05-13
3,4-Dihydro-2(1H)-quinazolinones and quniazolinethiones such as 1-cyclopropylmethyl-4-phenyl-6-methoxy-3,4-dihydro-2(1H)-quinazolinone and its thione derivative, are prepared in high yield with high purity by heating the corresponding arylurea or thiourea such as N-cyclopropylmethyl-N-(p-methoxyphenyl) urea or its thiourea derivative, with the corresponding aldehyde such as benzaldehyde in the presence of hydrobromic acid in an inert solvent.