Benzaldehyde → 1-isopropyl-4-phenyl-6,7-methylenedioxy-3,4-dihydro-2(1H)-quinazolinone

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Reaction Steps

A solution of 10.3 gm. of N-isopropyl-(3,4-methylenedioxyphenyl)urea, 7.1 ml. of benzaldehyde, and 3 drops of methanesulphonic acid in 250 ml. of toluene is refluxed under a water separator for 21 hours. The cooled solution is then washed with 200 ml. of water, dried and evaporated to yield a powder. This product is decolorized in hot propanol with a small amount of activated charcoal and recrystallized from propanol to obtain 1-isopropyl-4-phenyl-6,7-methylenedioxy-3,4-dihydro-2(1H)-quinazolinone, m.p. 169°-172°C.

Provenance & Evidence