Potassium Carbonate → (S)-6-Fluoro-3-[1-(3-hydroxy-2-methylpropyl)-4-piperidinyl]-1,2-benzisothiazole fumarate

HRID 267021

Reaktionsgleichung

Reaktionsgleichung von HRID 267021
[F:1][C:2]1[CH:16]=[CH:15][C:5]2[C:6]([CH:9]3[CH2:14][CH2:13][NH:12][CH2:11][CH2:10]3)=[N:7][S:8][C:4]=2[CH:3]=1.Br[CH2:18][C@H:19]([CH3:22])[CH2:20][OH:21].C([O-])([O-])=O.[K+].[K+].[C:29]([OH:36])(=[O:35])/[CH:30]=[CH:31]/[C:32]([OH:34])=[O:33]>CC(C)=O.S([O-])([O-])(=O)=O.C([N+](CCCC)(CCCC)CCCC)CCC.C([N+](CCCC)(CCCC)CCCC)CCC.CCOC(C)=O.O.CC#N>[C:29]([OH:36])(=[O:35])/[CH:30]=[CH:31]/[C:32]([OH:34])=[O:33].[F:1][C:2]1[CH:16]=[CH:15][C:5]2[C:6]([CH:9]3[CH2:10][CH2:11][N:12]([CH2:18][C@H:19]([CH3:22])[CH2:20][OH:21])[CH2:13][CH2:14]3)=[N:7][S:8][C:4]=2[CH:3]=1

Komponenten

10

Edukt 4

HCID 11430Potassium CarbonateHCID 444972Fumaric AcidHCID 10441885(R)-(-)-3-Bromo-2-methyl-1-propanolHCID 185049766-Fluoro-3-(4-piperidinyl)-1,2-benzisothiazole

Produkt 1

HCID 22868569(S)-6-Fluoro-3-[1-(3-hydroxy-2-methylpropyl)-4-piperidinyl]-1,2-benzisothiazole fumarateAusbeute 69,1 %

Reagenzien, Katalysatoren, Lösungsmittel 5

HCID 11433187Bis(tetrabutylammonium) sulphateKatalysatorHCID 180AcetoneLösungsmittelHCID 962WaterLösungsmittel2×HCID 6342AcetonitrileLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

A mixture of 6-fluoro-3-(4-piperidinyl)-1,2-benzisothiazole (4.6 g, 20 mmol), (R)-(-)-3-bromo-2-methyl-1-propanol (3.0 g, 20 mmol), K2CO3 (2.7 g, 20 mmol), tetrabutylammonium sulfate (0.058 g), CH3CN (95 ml) and H2O (19 ml) was stirred and refluxed for 4.5 hours. After standing at ambient temperature for 16 hours, the reaction was poured into H2O, and subsequent extractive workup of the aqueous with EtOAc yielded 6.8 g of a partially solidified oil. The product was purified by flash chromatography on silica gel, eluting the column with CH2Cl2, then 2% MeOH--CH2Cl2 and finally 5% MeOH--CH2Cl2. Concentration of the appropriate fractions yielded 5.2 g of a waxy solid. The solid was dissolved in acetone and fumaric acid (1.9 g, 1.0 eq) was added and the reaction briefly heated at reflux. The resultant fumarate salt precipitated from solution yielding 4.8 g of white solid. The compound was recrystallized from acetonitrile to yield 3.1 g (36%) of the alcohol as a white solid, m.p.=151°-153° C.

Aufarbeitung

  1. temperaturerefluxed for 4.5 hours
  2. customyielded 6.8 g of a partially solidified oil
  3. customThe product was purified by flash chromatography on silica gel
  4. washeluting the column with CH2Cl2
  5. customConcentration of the appropriate fractions yielded 5.2 g of a waxy solid
  6. customthe reaction
  7. temperaturebriefly heated
  8. temperatureat reflux
  9. customThe resultant fumarate salt precipitated from solution

Quellen und Nachweise

ORD-Eintrag
ord-4af2f7278e78442b8da877fd8733fd7d
Quelldatensatz
uspto-grants-1997_07
Patentnummer
US05652241

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