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

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The solution of 3-benzyloxycarbonyl-5-(2-cyanoethoxy)carbonyl-1,4-dihydro-2,6-dimethyl-4-(4-nitronitrophenyl)pyridine (3.24 g, 7.02 mmol) in 160ml of 4.4% (w/w) formic acid/MeOH mixture was stirred with Pd/C (10%, 3.24 g) for 30 min., the reaction was quenched by addition of 10 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 drying and removal of solvent, 3-(2-cyanoethoxy)carbonyl-1,4-dihydro-2,6-dimethyl-4-(4-nitrophenyl)pyridine-5-carboxylic acid was obtained as a yellow powder (1.94 g, 75%)

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