tert-Butyl piperazine-1-carboxylate → HCID 89676941, compound

HRID 2278185Notes

Reaction equation

HRID 2278185 reaction equation
[F:1][C:2]1[C:3]([N:10]2[CH2:15][CH2:14][O:13][CH2:12][CH2:11]2)=[C:4]([CH:7]=[CH:8][CH:9]=1)[CH:5]=O.[N:16]1([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:21][CH2:20][NH:19][CH2:18][CH2:17]1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClCCl>[F:1][C:2]1[C:3]([N:10]2[CH2:15][CH2:14][O:13][CH2:12][CH2:11]2)=[C:4]([CH2:5][N:19]2[CH2:18][CH2:17][N:16]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:21][CH2:20]2)[CH:7]=[CH:8][CH:9]=1

Participants

5

Reactant 3

HCID 143452tert-Butyl piperazine-1-carboxylateHCID 5049666Sodium triacetoxyborohydrideHCID 261887513-Fluoro-2-(morpholin-4-yl)benzaldehyde

Product 1

HCID 89676941HCID 89676941, compoundYield 121.4%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

A 50 mL round-bottom flask was charged with 3-fluoro-2-(morpholin-4-yl)benzaldehyde (0.500 g, 2.39 mmol, 1.00 equiv), tert-butyl piperazine-1-carboxylate (404 mg, 2.17 mmol, 0.91 equiv), dichloromethane (10 mL). The mixture was stirred at room temperature for 0.5 hour. Sodium triacetoxyborohydride (1.38 g, 6.51 mmol, 2.72 equiv) was added. The resulting solution was stirred overnight at room temperature and diluted with dichloromethane. The resulting mixture was washed with H2O (3×10 mL), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was chromatographed on a silica gel column with ethyl acetate/petroleum ether (1/3) to yield 1.00 g (crude) of tert-butyl 4-[[3-fluoro-2-(morpholin-4-yl)phenyl]methyl]piperazine-1-carboxylate as colorless oil. LCMS (ESI, m/z): 380 [M+H]+.

Workup

  1. stirringThe resulting solution was stirred overnight at room temperature
  2. washThe resulting mixture was washed with H2O (3×10 mL)
  3. dry with materialdried over anhydrous sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was chromatographed on a silica gel column with ethyl acetate/petroleum ether (1/3)

Sources & evidence

ORD record
ord-f5091fd4ee3642d581b38322fd6627fa
Source dataset
uspto-grants-2015_09
Patent number
US09133148B2

Reaction notes

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