Benzyl Bromide → 1,4-Dihydro-1-phenylmethylbenzo[c]-1,5-naphthyridin-2(3H)-one

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Reaction Steps

A stirred solution of 1,4-dihydrobenzo[c]-1,5-naphthyridin-2(3H)-one (3.97 g) in dimethylsulfoxide (sieve dried, 80 ml) was treated sequentially with powdered potassium hydroxide (2.64 g of 85% KOH) and benzyl bromide (3.76 g). The solution was stirred for 1.5 hours at ambient temperature, transferred to a separatory funnel, diluted with water (400 ml) and extracted with ethyl acetate (2×250 ml). The organic phase was washed with water (2×200 ml), dried (Na2SO4), filtered and evaporated to give a solid (4.9 g). Recrystallization from 95% ethanol (32 ml) gave 3.35 g of crystals, m.p. 153.5°-155.5° C.

Provenance & Evidence