Cinchonidine → (R)-1-(2-methoxyethoxy)methyl-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine

HRID 34402

반응식

HRID 34402 반응식
[CH3:1][O:2][CH2:3][CH2:4][O:5][CH2:6][N:7]1[C:12]([CH3:13])=[C:11]([C:14]([OH:16])=[O:15])[CH: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].C=C[C@@H]1[C@@H]2C[C@@H]([C@H](O)C3C=CN=C4C=CC=CC=34)N(CC2)C1>CCO>[CH3:1][O:2][CH2:3][CH2:4][O:5][CH2:6][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]

참가 물질

4

반응물 2

HCID 101744CinchonidineHCID 14208794(+)-1-(2-Methoxyethoxymethyl)-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine

생성물 1

HCID 14208796(R)-1-(2-methoxyethoxy)methyl-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine

시약·촉매·용매 1

HCID 702Ethanol용매

실험 절차

The racemic N-protected mono-ester of formula 18 is then dissolved in a suitable lower alkanol solvent at about the solvent reflux temperature along with a suitable optically active base, and the resulting salt allowed to crystallize as the solution cools to provide the optically resolved salt of either the (R)-18 or (S)-18. (It is preferred to recrystallize the resulting optically active salt to obtain a higher degree of purity.) For example, (RS)-1-(2-methoxyethoxy)methyl-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine is dissolved in EtOH at reflux temperature along with one molar equivalent of cinchonidine, and the mixture allowed to stand at room temperature overnight. The resulting crystals are recrystallized twice from EtOH to yield the pure (R)-18 salt, (R)-1-(2-methoxyethoxy)methyl-2,6-dimethyl-3-carbomethoxy-4-(3-nitrophenyl)-5-carboxy-1,4-dihydropyridine.cinchonidine. (Scheme VI, Step 3)

후처리

  1. temperaturereflux temperature along with a suitable optically active base
  2. customto crystallize as the solution
  3. customto provide the optically resolved salt of either the (R)-18 or (S)-18
  4. customto recrystallize the resulting optically active salt
  5. customto obtain a higher degree of purity
  6. customThe resulting crystals are recrystallized twice from EtOH

출처 및 근거

ORD 기록
ord-d6ac2fb5ba9449b696c383cb13dd32fa
출처 데이터셋
uspto-grants-1988_08
특허 번호
US04761420

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