Sodium Carbonate → HCID 21471614, compound

HRID 2294910Notes

Reaction equation

HRID 2294910 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][C:11](=O)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH3:15][C:16]1[CH:31]=[CH:30][C:19]2[N:20]([CH:24]3[CH2:29][CH2:28][NH:27][CH2:26][CH2:25]3)[C:21](=[O:23])[NH:22][C:18]=2[CH:17]=1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C([O-])([O-])=O.[Na+].[Na+]>C(Cl)(Cl)Cl.C(O)(=O)C.ClCCCl>[CH3:15][C:16]1[CH:31]=[CH:30][C:19]2[N:20]([CH:24]3[CH2:25][CH2:26][N:27]([CH:11]4[CH2:12][CH2:13][N:8]([C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:7])[CH2:9][CH2:10]4)[CH2:28][CH2:29]3)[C:21](=[O:23])[NH:22][C:18]=2[CH:17]=1

Participants

8

Reactant 4

HCID 10340Sodium CarbonateHCID 735900tert-Butyl 4-oxopiperidine-1-carboxylateHCID 5049666Sodium triacetoxyborohydrideHCID 13792103HCID 13792103, compound

Product 1

HCID 21471614HCID 21471614, compoundYield 73.4%

Reagents, catalysts & solvents 3

HCID 111,2-DichloroethaneSolventHCID 176Acetic AcidSolventHCID 6212ChloroformSolvent

Procedure

A mixture of 4.5 g N-t-butyloxycarbonyl-4-piperidone, 4.7 g of 4-(5-methyl-2-oxo-1-benzimidazolinyl)piperidine, 65 mL of 1,2-dichloroethane, 1.3 mL of glacial acetic acid and 6.4 g of sodium triacetoxyborohydride was stirred at room temperature for 48 h. The reaction mixture was poured into 500 mL chloroform and 500 mL saturated aqueous Na2CO3 and the layers separated. The aqueous layer was extracted with 2×250 mL of chloroform and the combined organic layers dried over MgSO4 and concentrated under reduced pressure. Recrystallization of the crude product from50 mL of ethyl acetate gave in two crops 6.18 g of pure 5-methyl-1,3-dihydro-1-{1-[1-(t-butyloxycarbonyl)piperidin-4-yl]piperidin-4-yl}-2H-benzimidazol-2-one as a white solid: mp 210°-211° C.

Workup

  1. customthe layers separated
  2. extractionThe aqueous layer was extracted with 2×250 mL of chloroform
  3. dry with materialthe combined organic layers dried over MgSO4
  4. concentrationconcentrated under reduced pressure
  5. customRecrystallization of the crude product from50 mL of ethyl acetate

Sources & evidence

ORD record
ord-24eab71a078847039aeebd4ccf9891dc
Source dataset
uspto-grants-1997_11
Patent number
US05691323

Reaction notes

Loading…