9-{4-[3-(1,1-Difluoroethyl)phenoxy]phenyl}-7-methyl-3,4-dihydropyrido[2,1-c][1,2,4]thiadiazine 2,2-dioxide → 9-{4-[3-(1,1-Difluoroethyl)phenoxy]phenyl}-7-methyl-3,4,6,7,8,9-hexahydropyrido[2,1-c][1,2,4]thiadiazine 2,2-dioxide

HRID 1622778Notes

Reaction equation

HRID 1622778 reaction equation
[F:1][C:2]([C:5]1[CH:6]=[C:7]([CH:28]=[CH:29][CH:30]=1)[O:8][C:9]1[CH:14]=[CH:13][C:12]([C:15]2[C:20]3=[N:21][S:22](=[O:26])(=[O:25])[CH2:23][CH2:24][N:19]3[CH:18]=[C:17]([CH3:27])[CH:16]=2)=[CH:11][CH:10]=1)([F:4])[CH3:3]>C1COCC1.CO.[Pt](=O)=O>[F:4][C:2]([C:5]1[CH:6]=[C:7]([CH:28]=[CH:29][CH:30]=1)[O:8][C:9]1[CH:10]=[CH:11][C:12]([CH:15]2[C:20]3=[N:21][S:22](=[O:26])(=[O:25])[CH2:23][CH2:24][N:19]3[CH2:18][CH:17]([CH3:27])[CH2:16]2)=[CH:13][CH:14]=1)([F:1])[CH3:3]

Participants

5

Reactant 1

HCID 667481929-{4-[3-(1,1-Difluoroethyl)phenoxy]phenyl}-7-methyl-3,4-dihydropyrido[2,1-c][1,2,4]thiadiazine 2,2-dioxide

Product 1

HCID 667478879-{4-[3-(1,1-Difluoroethyl)phenoxy]phenyl}-7-methyl-3,4,6,7,8,9-hexahydropyrido[2,1-c][1,2,4]thiadiazine 2,2-dioxide

Reagents, catalysts & solvents 3

HCID 345198Adams' catalystCatalystHCID 887MethanolSolventHCID 8028TetrahydrofuranSolvent

Procedure

To a suspension of NaH (60%, 96 mg) in THF (dry) (10 mL) was added 2-chloroethanesulfonyl chloride (0.101 mL) at 0° C. and the mixture was stirred for 10 min at the same temperature. A solution of 3-(4-(3-(1,1-difluoroethyl)phenoxy)phenyl)-5-methylpyridin-2-amine (164 mg) in THF (dry) (10 mL) was added at 0° C. and the mixture was stirred at room temperature under nitrogen overnight. The mixture was quenched with water at 0° C. Water, EtOAc and THF were added and the mixture was extracted. Silica-gel was added to the organic phase and the volatiles were removed in vacuo. The mixture supported on silica-gel was purified by column chromatography (silica gel, eluted with MeOH in EtOAc) and concentrated in vacuo to give 9-{4-[3-(1,1-difluoroethyl)phenoxy]phenyl}-7-methyl-3,4-dihydropyrido[2,1-c][1,2,4]thiadiazine 2,2-dioxide as a white solid. Platinum(IV) oxide (30 mg) was added to a solution of the prepared 9-{4-[3-(1,1-difluoroethyl)phenoxy]phenyl}-7-methyl-3,4-dihydropyrido[2,1-c][1,2,4]thiadiazine 2,2-dioxide in THF (dry) (15 mL) and MeOH (15 ml). The mixture was stirred at room temperature under hydrogen for 3 hr. Activated carbon was added and the insoluble solid was removed by filtration through silica gel/Celite pad (eluted with EtOAc, to remove catalytic poison). Platinum(IV) oxide (30 mg) was added and the mixture was stirred at room temperature under hydrogen overnight. Activated carbon was added and the insoluble solid was removed by filtration through silica gel/Celite pad (eluted with EtOAc) and the filtrate was concentrated in vacuo. The residue was crystallized from THF/IPE to give the title compound (47.6 mg) as colorless crystals.

Workup

  1. additionActivated carbon was added
  2. customthe insoluble solid was removed by filtration through silica gel/Celite pad (eluted with EtOAc, to remove catalytic poison)
  3. additionPlatinum(IV) oxide (30 mg) was added
  4. stirringthe mixture was stirred at room temperature under hydrogen overnight
  5. additionActivated carbon was added
  6. customthe insoluble solid was removed by filtration through silica gel/Celite pad (eluted with EtOAc)
  7. concentrationthe filtrate was concentrated in vacuo
  8. customThe residue was crystallized from THF/IPE

Sources & evidence

ORD record
ord-3ba5e0009e524434b012446932244ea2
Source dataset
uspto-grants-2014_07
Patent number
US08778934B2

Reaction notes

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