Acetone → (4R)-5-(Methoxycarbonyl)-2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3-carboxylic acid

HRID 34403Notes

Reaction equation

HRID 34403 reaction equation
COCCOC[N:7]1[C:12]([CH3:13])=[C:11]([C:14]([OH:16])=[O:15])[C@@H:10]([C:17]2[CH:22]=[CH:21][CH:20]=[C:19]([N+:23]([O-:25])=[O:24])[CH:18]=2)[C:9]([C:26]([O:28][CH3:29])=[O:27])=[C:8]1[CH3:30].CC(C)=O.Cl>C(Cl)Cl.O.C1COCC1>[CH3:30][C:8]1[NH:7][C:12]([CH3:13])=[C:11]([C:14]([OH:16])=[O:15])[C@@H:10]([C:17]2[CH:22]=[CH:21][CH:20]=[C:19]([N+:23]([O-:25])=[O:24])[CH:18]=2)[C:9]=1[C:26]([O:28][CH3:29])=[O:27]

Participants

7

Reactant 3

HCID 180AcetoneHCID 313Hydrochloric AcidHCID 14208796(R)-1-(2-methoxyethoxy)methyl-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine2×

Product 1

HCID 748472(4R)-5-(Methoxycarbonyl)-2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3-carboxylic acid

Reagents, catalysts & solvents 3

HCID 962WaterSolvent2×HCID 6344DichloromethaneSolventHCID 8028TetrahydrofuranSolvent

Procedure

The resolved mono-ester of formula 18 is then deprotected by acid hydrolysis using a dilute (about 1N to about 2N) mineral acid in a suitable water-miscible solvent (preferably acetone or THF) at a temperature between about 0° and about 15° C. for about 30 to about 120 minutes. For example, (R)-1-(2-methoxyethoxy)methyl-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine is dissolved in CH2Cl2, treated with 1N HCl at 0° C., and allowed to stand for one hour at room temperature. Then, water (100 mL) is added, and the resulting precipitate is filtered to yield (R)-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine (19). (Scheme VI, Step 5)

Workup

  1. filtrationthe resulting precipitate is filtered

Sources & evidence

ORD record
ord-f25c5e2824a8409298d1965c750e1b02
Source dataset
uspto-grants-1988_08
Patent number
US04761420

Reaction notes

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