Formic acid methanol → 3-(2-Cyanoethoxy)carbonyl-2,6-diethyl-1,4-dihydro-4-(4-nitrophenyl)pyridine-5-carboxylic acid

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The solution of 3-benzyloxycarbonyl-5-(2-cyanoethoxy) carbonyl-2,6-diethyl-1,4-dihydro-4-(4-nitrophenyl)pyridine (6.30 g, 13.0 mmol) in 250 ml of 4.4% (w/w) formic acid/MeOH mixture was stirred with Pd/C (10%, 6.0 g) for 30 min., the reaction was quenched by addition of 100 ml of CHCl3. The mixture was filtered and concentration of filtrate give a yellow powder, which was dissolved in CHCl3, washed with water and 1N HCl. After filtration and removal of solvent, 3-(2-cyanoethoxy)carbonyl-2,6-diethyl-1,4-dihydro-4-(4-nitrophenyl)pyridine-5-carboxylic acid was obtained as a yellow powder (4.5 g, 87%).

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