HCID 56998903, compound → HCID 135703738, compound

Participants

Reaction Conditions

Reaction Steps

1 g of 9-methyl-6-phenylhydrazono-1,2,3,4,6,7,8,9-octahydro-pyrido[2,1-b]quinazoline-11-one is added to 15 g of polyphosphoric acid heated to 170° C. and the mixture is stirred for 20 minutes at 180° C. After cooling, the dark melt is diluted with 50 ml of water. Greenish-yellow crystals are precipitated, which are filtered and washed with water. After drying, the product is recrystallized from ethanol. 0.4 g of 7-methyl-5-oxo-1,2,3,4,7,8-hexahydro-5H,13H-indolo[2',3';3,4]pyrido[2,1-b]quinazoline are obtained melting at 232° C.

Provenance & Evidence