5-[8-Methoxy-1-(4-methoxycarbonyl benzyl)-2-oxo-1,2,3,4-tetrahydroquinolin-5-ylmethylidene]thiazolidine-2,4-dione → 5-[8-Methoxy-1-(4-methoxycarbonylbenzyl)-2-oxo-1,2,3,4-tetrahydroquinolin-5-ylmethyl]thiazolidine-2,4-dione

Participants

Reaction Steps

7.0 g of 10% palladium carbon was added to a DMF solution (70 ml) of 7.0 g of 5-[8-methoxy-1-(4-methoxycarbonyl benzyl)-2-oxo-1,2,3,4-tetrahydroquinolin-5-ylmethylidene]thiazolidine-2,4-dione, and a catalytic reduction was carried out at 40° C. for 5 hours. The catalyst was removed by filtration and the filtrate was concentrated. The residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=4:1→1:1). The purified product was recrystallized from an ethyl acetate-diethyl ether mixed solvent, giving 5.23 g (74% yield) of 5-[8-methoxy-1-(4-methoxycarbonylbenzyl)-2-oxo-1,2,3,4-tetrahydroquinolin-5-ylmethyl]thiazolidine-2,4-dione as a white powder.

Provenance & Evidence