1,2-Dichloroethane → (+/-)-trans-3-bromo-6-cyano 3,4-dihydro-2,2-dimethyl-4-[(S)-(-)-3-(3,5-dinitrobenzoylthio)-2-methylpropionyloxy]-2H-1benzopyran

HRID 373340

Reaktionsgleichung

Reaktionsgleichung von HRID 373340
[Br:1][C@H:2]1[C@H:7]([OH:8])[C:6]2[CH:9]=[C:10]([C:13]#[N:14])[CH:11]=[CH:12][C:5]=2[O:4][C:3]1([CH3:16])[CH3:15].C(Cl)CCl.[N+:21]([C:24]1[CH:25]=[C:26]([CH:36]=[C:37]([N+:39]([O-:41])=[O:40])[CH:38]=1)[C:27]([S:29][CH2:30][C@H:31]([CH3:35])[C:32](Cl)=[O:33])=[O:28])([O-:23])=[O:22]>N1C=CC=CC=1>[Br:1][C@H:2]1[C@H:7]([O:8][C:32](=[O:33])[C@H:31]([CH3:35])[CH2:30][S:29][C:27](=[O:28])[C:26]2[CH:36]=[C:37]([N+:39]([O-:41])=[O:40])[CH:38]=[C:24]([N+:21]([O-:23])=[O:22])[CH:25]=2)[C:6]2[CH:9]=[C:10]([C:13]#[N:14])[CH:11]=[CH:12][C:5]=2[O:4][C:3]1([CH3:16])[CH3:15]

Komponenten

5

Edukt 3

HCID 111,2-DichloroethaneHCID 6932483trans-2,2-Dimethyl-3-bromo-6-cyanochroman-4-olHCID 15045107(S)-(-)-3-(3,5-dinitrobenzoylthio)-2-methylpropionyl chloride

Produkt 1

HCID 86745229(+/-)-trans-3-bromo-6-cyano 3,4-dihydro-2,2-dimethyl-4-[(S)-(-)-3-(3,5-dinitrobenzoylthio)-2-methylpropionyloxy]-2H-1benzopyranAusbeute 93,1 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 1049PyridineLösungsmittel

Versuchsvorschrift

To a mixture of 14.5 g of (±)-trans-3-bromo-6-cyano-3,4-dihydro-2,2-dimethyl-4-hydroxy-2H-1-benzopyran, 60 ml of ethylene chloride and 1.6 ml of pyridine was added 5.5 g of (S)-(-)-3-(3,5-dinitrobenzoylthio)-2-methylpropionyl chloride under ice-cooling and was stirred for 1.5 hours under room temperature. The reaction mixture was washed with diluted hydrochloric acid once and 10% aqueous sodium chloride solution twice. The organic layer was separated, dried over magnesium sulfate and concentrated under reduced pressure to give 8.9 g of (±)-trans-3-bromo-6-cyano-3,4-dihydro-2,2-dimethyl-4-[(S)-(-)-3-(3,5-dinitrobenzoylthio)-2-methylpropionyloxy]-2H-1-benzopyran as light yellow semicrystals.

Aufarbeitung

  1. temperaturecooling
  2. washThe reaction mixture was washed with diluted hydrochloric acid once
  3. customThe organic layer was separated
  4. dry with materialdried over magnesium sulfate
  5. concentrationconcentrated under reduced pressure

Quellen und Nachweise

ORD-Eintrag
ord-d5225a4c078a401c8f15e00d25491bbb
Quelldatensatz
uspto-grants-1992_11
Patentnummer
US05162553

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