HCID 14423306, compound → HCID 15135971, compound

Participants

Reaction Steps

Charge a Paar bottle with 5,6-dihydro-3-hydroxy-12-phenyl-naphtho[1,2-b] [1,8]naphthyridin-7(12H)-one, an equal weight of 5% Pd on carbon, and ethanol. Pressurize the bottle with hydrogen to about 50 psi, and shake the contents in a Paar apparatus at 25° C. Monitor the progress of hydrogenation by pressure changes or by thin-layer chromatography. When hydrogen uptake ceases, remove catalyst by filtration and ethanol by evaporation. Crystallize the residue to obtain 5,6,8,9,10,11-hexahydro-3-hydroxy-12-phenyl-naphtho[1,2-b] [1,8]naphthyridin-7(12H)-one, m.p. >330° C. after crystallization from C2H5OH.

Provenance & Evidence