Sodium methanesulfinate → 10-Chloro-7-(1-ethylpropyl)-1-[3-methyl-5-(methylsulfonyl)pyridin-2-yl]-2,3,4,5-tetrahydro-1H-[1,3]diazepino[1,2-a]benzimidazole

HRID 1399229Notes

Reaction equation

HRID 1399229 reaction equation
Br[C:2]1[CH:3]=[C:4]([CH3:28])[C:5]([N:8]2[C:14]3=[N:15][C:16]4[C:21]([Cl:22])=[CH:20][CH:19]=[C:18]([CH:23]([CH2:26][CH3:27])[CH2:24][CH3:25])[C:17]=4[N:13]3[CH2:12][CH2:11][CH2:10][CH2:9]2)=[N:6][CH:7]=1.[CH3:29][S:30]([O-:32])=[O:31].[Na+]>CN1CCCC1=O.C(OCC)(=O)C.[Cu]I>[Cl:22][C:21]1[C:16]2[N:15]=[C:14]3[N:8]([C:5]4[C:4]([CH3:28])=[CH:3][C:2]([S:30]([CH3:29])(=[O:32])=[O:31])=[CH:7][N:6]=4)[CH2:9][CH2:10][CH2:11][CH2:12][N:13]3[C:17]=2[C:18]([CH:23]([CH2:26][CH3:27])[CH2:24][CH3:25])=[CH:19][CH:20]=1

Participants

6

Reactant 2

HCID 2733271Sodium methanesulfinateHCID 577864001-(5-bromo-3-methylpyridin-2-yl)-10-chloro-7-(1-ethylpropyl)-2,3,4,5-tetrahydro-1H-[1,3]diazepino[1,2-a]benzimidazole

Product 1

HCID 5778610110-Chloro-7-(1-ethylpropyl)-1-[3-methyl-5-(methylsulfonyl)pyridin-2-yl]-2,3,4,5-tetrahydro-1H-[1,3]diazepino[1,2-a]benzimidazoleYield 36.2%

Reagents, catalysts & solvents 3

HCID 24350Copper(1+) iodide; Copper(I) iodide; Cuprous iodide; Cuprous iodide (CuI)CatalystHCID 8857Ethyl AcetateSolventHCID 13387N-methyl-2-pyrrolidoneSolvent

Conditions

Temperature
180 °C

Procedure

A mixture of 1-(5-bromo-3-methylpyridin-2-yl)-10-chloro-7-(1-ethylpropyl)-2,3,4,5-tetrahydro-1H-[1,3]diazepino[1,2-a]benzimidazole (463 mg, 0.216 mmol), 1.0 sodium methanesulfinate (66 mg, 0.648 mmol) and copper(I) iodide (123 mg, 0.648 mmol) in 1-methyl-2-pyrrolidinone (1.0 mL) was heated under microwave irradiation at 180° C. for 1 hr. After cooling, the mixture was diluted with ethyl acetate, filtered through a pad of celite, washed with water and brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified by flash chromatography on silica gel eluting with a 10-50% ethyl acetate/n-hexane gradient mixture followed by recrystallization from ethyl acetate/n-hexane to afford the title compound (36 mg, 36%) as a colorless solid.

Workup

  1. temperatureAfter cooling
  2. filtrationfiltered through a pad of celite
  3. washwashed with water and brine
  4. dry with materialdried over anhydrous sodium sulfate
  5. concentrationconcentrated in vacuo
  6. customThe residue was purified by flash chromatography on silica gel eluting with a 10-50% ethyl acetate/n-hexane gradient mixture
  7. customfollowed by recrystallization from ethyl acetate/n-hexane

Sources & evidence

ORD record
ord-231bcd94de56496eb2c46c0c44e42758
Source dataset
uspto-grants-2014_12
Patent number
US08901141B2

Reaction notes

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