Triethylamine → 1,1-Dimethylethyl (2S)-4-{[4-(acetylamino)-2-methylphenyl]methyl}-2-methyl-1-piperazinecarboxylate

HRID 883794Notes

Reaction equation

HRID 883794 reaction equation
[CH:1]([C:3]1[CH:8]=[CH:7][C:6]([NH:9][C:10](=[O:12])[CH3:11])=[CH:5][C:4]=1[CH3:13])=O.Cl.[CH3:15][C@H:16]1[CH2:21][NH:20][CH2:19][CH2:18][N:17]1[C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23].C(N(CC)CC)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C([O-])(O)=O.[Na+]>ClCCCl>[C:10]([NH:9][C:6]1[CH:7]=[CH:8][C:3]([CH2:1][N:20]2[CH2:19][CH2:18][N:17]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[C@@H:16]([CH3:15])[CH2:21]2)=[C:4]([CH3:13])[CH:5]=1)(=[O:12])[CH3:11]

Participants

7

Reactant 5

HCID 8471TriethylamineHCID 516892Sodium BicarbonateHCID 5049666Sodium triacetoxyborohydrideHCID 12931765N-(4-Formyl-3-methylphenyl)acetamideHCID 45072182(S)-tert-butyl 2-methylpiperazine-1-carboxylate hydrochloride

Product 1

HCID 592621441,1-Dimethylethyl (2S)-4-{[4-(acetylamino)-2-methylphenyl]methyl}-2-methyl-1-piperazinecarboxylateYield 88.1%

Reagents, catalysts & solvents 1

HCID 111,2-DichloroethaneSolvent

Procedure

N-(4-Formyl-3-methylphenyl)acetamide (D52) (326 mg, 1.8 mmol), 1,1-dimethylethyl (2S)-2-methyl-1-piperazinecarboxylate hydrochloride (436 mg, 1.8 mmol), triethylamine (0.282 ml, 2 mmol) and sodium tri(acetoxy)borohydride (781 mg, 3.7 mmol) were stirred together in 1,2-DCE (15 ml) for 17 h. Saturated aqueous NaHCO3 was added and the reaction mixture stirred for 1 h. The organic layer was separated and washed with water and brine, then dried and concentrated to give the crude product which was purified by chromatography. Elution with 0-100% EtOAc/petroleum ether yielded the title compound as a colourless oil (573 mg). δH (CDCl3, 400 MHz) 7.27 (2H, m), 7.16 (1H, d), 7.11 (1H, br.s), 4.17 (1H, m), 3.78 (1H, m), 3.36 (2H, s), 3.02 (1H, m), 2.70 (1H, m), 2.56 (1H, m), 2.36 (3H, s), 2.17 (4H, m), 1.95 (1H, m), 1.45 (9H, s), 1.18 (3H, d). MH+ 362.3.

Workup

  1. customThe organic layer was separated
  2. washwashed with water and brine
  3. customdried
  4. concentrationconcentrated
  5. customto give the crude product which
  6. customwas purified by chromatography
  7. washElution with 0-100% EtOAc/petroleum ether

Sources & evidence

ORD record
ord-93e9d69c64934880b16408b92ef87fe2
Source dataset
uspto-grants-2012_08
Patent number
US08236953B2

Reaction notes

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