[N:1]([CH2:4][CH2:5][CH2:6][CH2:7][C:8]1[NH:9][C:10]([CH3:34])=[C:11]([C:30]([O:32][CH3:33])=[O:31])[CH:12]([C:21]2[CH:26]=[CH:25][C:24]([N+:27]([O-:29])=[O:28])=[CH:23][CH:22]=2)[C:13]=1[C:14]([O:16]CCC#N)=[O:15])=[N+:2]=[N-:3].[OH-].[K+]>CC(C)=O>[N:1]([CH2:4][CH2:5][CH2:6][CH2:7][C:8]1[NH:9][C:10]([CH3:34])=[C:11]([C:30]([O:32][CH3:33])=[O:31])[CH:12]([C:21]2[CH:22]=[CH:23][C:24]([N+:27]([O-:29])=[O:28])=[CH:25][CH:26]=2)[C:13]=1[C:14]([OH:16])=[O:15])=[N+:2]=[N-:3]A solution of 2-(4-azidobutyl)-3-(2-cyanoethoxy)carbonyl-1,4-dihydro-5-methoxycarbonyl-6-methyl-4-(4-nitrophenyl)pyridine (1.38 g,. 2.95 mmol) in 10 ml acetone was treated with 15 ml 1N KOH solution at 0° C. for 1 hr. The acetone was removed in vacuo and the aqueous layer was acidified to pH=3 by 2N hydrochloric acid, the resulting yellow precipitate was collected by filtration, washed with 10 ml of cold water and dried in vacuo to yield 750 mg (61% yield) of 2-(4-azidobutyl)-1,4-dihydro-5-methoxycarbonyl-6-methyl-4-(4-nitrophenyl)pyridine-3-carboxylic acid as a yellow powder.
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