反应详情

A solution of 3.6 g (7.3 mmol) of 8-benzyloxy-7-methoxy-4-oxo-1,4-dihydrobenzo[g]quinoline-3-carbonitrile and 0.7 g of 10% Pd/C in 240 mL of dimethyl formamide is hydrogenated in a Parr shaker at 40 psi for 24 hours. The catalyst is filtered through a pad of Celite, Is washed with dimethyl formamide and the solvent is reduced in vacuo to yield a solid. The crude product is suspended in ether, collected by filtration, further washed with ether and dried to yield 3.0 g of 8-hydroxy-7-methoxy-4-oxo-1,4-dihydrobenzo[g]quinoline-3-carbonitrile as a yellow solid, mp>300° C.

1. filtrationThe catalyst is filtered through a pad of Celite
2. washIs washed with dimethyl formamide
3. customto yield a solid
4. filtrationcollected by filtration
5. washfurther washed with ether
6. customdried