Process for preparing 3,4-dihydro-2(1H)-quinazolinone derivative

Details Process for preparing 3,4-dihydro-2(1H)-quinazolinone derivative Process for preparing 3,4-dihydro-2(1H)-quinazolinone derivative

Filed on

1976-10-12

Date issued

1980-05-13

Examiner

Daus, Donald G.

Patent Class

Organic compounds -- part of the class 532-570 series

SubClass

Organic compounds

SubSubClass

Four or more ring nitrogens in the bicyclo ring system

Other Related Categories

544284, 544286, A61K 31505, C07D23982, C07D49104

Type

Patent

Status

active

Patent number

042029740

Description

ABSTRACT:
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.

REFERENCES:
patent: 3686178 (1972-08-01), Cooke et al.
patent: 3748331 (1973-07-01), Cooke et al.
patent: 3764600 (1973-10-01), Ott
patent: 3829420 (1974-08-01), Inaba et al.

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