Hydrochloric Acid → HCID 15557214, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 2.59 g (0.01 mole) of 2-amino-1-methyl-3-phenylindole in 15 ml of pyridine, 2.84 g (0.026 mole) of ethylchlorocarbonate is added. The reaction mixture is heated to 75° C. for about 2 hours, allowed to cool and 2.84 g more of ethylchlorocarbonate is added. The reaction mixture, heated for a further 3 hours, is then poured into about 200 ml of aqueous 10% HCl solution, the product is extracted with ethyl ether and the organic layer washed with water. The resulting etheral solution, dried over sodium sulfate, is concentrated to a volume of about 30 ml, 20 ml of hexane is added and the solution is once again concentrated to 35 ml. The product, 2.3 g of 1-methyl-3-phenylindole-2-carbamic acid ethyl ester, is thus crystallized; (m.p. 159°-161° C.; yield 80%). A quantity of 1.4 g of the so obtained carbamate is heated to 270° C. for 15 minutes and the residue crystallized from dimethylformamide, yielding 1.15 g of 7-methylindolo[2,3-c]isoquinolin-5(6H)-one. M.p. 350° C. (with decomposition). Yield 95%.

Provenance & Evidence