Thionyl Chloride → Lercanidipine Impurity 5

HRID 34398

反応式

HRID 34398 の反応式
[CH3:1][C:2]1[NH:3][C:4]([CH3:24])=[C:5]([C:21](O)=[O:22])[CH:6]([C:12]2[CH:17]=[CH:16][CH:15]=[C:14]([N+:18]([O-:20])=[O:19])[CH:13]=2)[C:7]=1[C:8]([O:10][CH3:11])=[O:9].O=S(Cl)[Cl:27]>>[CH3:1][C:2]1[NH:3][C:4]([CH3:24])=[C:5]([C:21]([Cl:27])=[O:22])[CH:6]([C:12]2[CH:17]=[CH:16][CH:15]=[C:14]([N+:18]([O-:20])=[O:19])[CH:13]=2)[C:7]=1[C:8]([O:10][CH3:11])=[O:9]

参加物

3

反応物 2

HCID 24386Thionyl ChlorideHCID 1733222,6-Dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylic acid monomethyl ester

生成物 1

HCID 13317254Lercanidipine Impurity 5

実験手順

Compounds of formula 1 may also be prepared by the following variation of Scheme IV, especially where optically active compounds are desired. A suitable dihydropyridine derivative acid is prepared and the optical isomers separated (where desired) following the procedure set forth by T. Shibanuma, et al., Chem. Pharm. Bull., 28, 2809-2812 (1980). For example, 2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine is N-protected, and subsequently resolved with an optically active amine, e.g., cinchonine, to prepare (+)-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine (12+) and (-)-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine (after deprotection). The resolved dihydropyridine acid derivative is then treated with SOCl2 in a suitable solvent, e.g., dichloromethane, to produce a dihydropyridine acyl chloride for condensation with an intermediate of the formula X--A--OH, where X is halo. For example, (-)-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine is reacted with SOCl2 to yield 2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-chlorocarbonyl-1,4-dihydropyridine, which is then reacted 3-bromopropanol to give the 3-bromopropoxy carbonyl derivative, which is then reacted with 4-(2-tetrahydropyran- 2-yloxyethyl)phenol (10) in CH2Cl2 with triethylamine to generate (S,RS)-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-(3-[4-(2-tetrahydropyran-2-yloxyethyl)phenoxy]propoxycarbonyl)-1,4-dihydropyridine (1+).

後処理

  1. customfor condensation with an intermediate of the formula X

出典と根拠

ORDレコード
ord-02bb4b7f27e44e6bb2bfd920b98e08dc
出典データセット
uspto-grants-1988_08
特許番号
US04761420

関連ノート

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