Methanamine, N-methoxy-, hydrochloride (1:1) → (R)-tert-butyl 3-(N-methoxy-N-methylcarbamoyl)piperidine-1-carboxylate

HRID 218367Notes

Reaction equation

HRID 218367 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH2:11][C@@H:10]([C:14]([OH:16])=O)[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].Cl.[CH3:18][NH:19][O:20][CH3:21].CCN=C=NCCCN(C)C.Cl.C(N(C(C)C)CC)(C)C>ClCCl.CCOC(C)=O>[CH3:21][O:20][N:19]([CH3:18])[C:14]([C@@H:10]1[CH2:11][CH2:12][CH2:13][N:8]([C:6]([O:5][C:1]([CH3:2])([CH3:3])[CH3:4])=[O:7])[CH2:9]1)=[O:16]

Participants

7

Reactant 4

HCID 81138Methanamine, N-methoxy-, hydrochloride (1:1)HCID 81531DiisopropylethylamineHCID 6435161-(1,1-Dimethylethyl) (3R)-1,3-piperidinedicarboxylateHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochloride

Product 1

HCID 30025965(R)-tert-butyl 3-(N-methoxy-N-methylcarbamoyl)piperidine-1-carboxylateYield 82%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8857Ethyl AcetateSolvent

Procedure

(R)-1-(tert-Butoxycarbonyl)piperidine-3-carboxylic acid (25 g, 0.11 mol, 1.0 equiv), N,O-dimethylhydroxylamine hydrochloride, (10.5 g, 0.14 mol, 1.25 equiv) and EDCI.HCl (26.3 g, 0.14 mol, 1.25 equiv) and diisopropylethylamine (48 mL, 0.28 mol, 2.5 equiv) were dissolved in dichloromethane (400 mL) and stirred overnight at rt. The reaction mixture was diluted with EtOAc, washed with 5% aq HCl (2×150 mL), satd aq NaHCO3 (150 mL), brine (100 mL), and dried over Na2SO4. Concentration afforded (R)-tert-butyl 3-(methoxy(methyl)carbamoyl)piperidine-1-carboxylate (24.42 g, 82%) as a clear oil. The crude product was used for next step without further purification. MS ESI+ve m/z 295 (M+Na). 1H NMR (CDCl3) δ 4.19-4.00 (m, 2H), 3.77 (m, 3H), 3.12 (s, 3H), 2.79 (m, 2H), 2.64 (m, 1H), 1.89 (m, 1H), 1.71-1.52 (m, 2H), 1.51-1.33 (m, 10H).

Workup

  1. washwashed with 5% aq HCl (2×150 mL), satd aq NaHCO3 (150 mL), brine (100 mL)
  2. dry with materialdried over Na2SO4
  3. concentrationConcentration

Sources & evidence

ORD record
ord-15c1ae2fe8924b6a9b202dc8a63930f7
Source dataset
uspto-grants-2012_06
Patent number
US08198453B2

Reaction notes

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