Diisopropylethylamine → Ethyl 2-{4-[(1-methylcyclobutyl)carbamoyl]piperidin-1-yl}-6-azaspiro[3.4]octane-6-carboxylate

HRID 1777295Notes

Reaction equation

HRID 1777295 reaction equation
[CH2:1]([O:3][C:4]([N:6]1[CH2:22][CH2:21][C:8]2([CH2:11][CH:10]([N:12]3[CH2:17][CH2:16][CH:15]([C:18](O)=[O:19])[CH2:14][CH2:13]3)[CH2:9]2)[CH2:7]1)=[O:5])[CH3:2].Cl.[CH3:24][C:25]1([NH2:29])[CH2:28][CH2:27][CH2:26]1.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.CCN(C(C)C)C(C)C>CN(C=O)C>[CH3:24][C:25]1([NH:29][C:18]([CH:15]2[CH2:16][CH2:17][N:12]([CH:10]3[CH2:11][C:8]4([CH2:21][CH2:22][N:6]([C:4]([O:3][CH2:1][CH3:2])=[O:5])[CH2:7]4)[CH2:9]3)[CH2:13][CH2:14]2)=[O:19])[CH2:28][CH2:27][CH2:26]1

Participants

6

Reactant 4

HCID 81531DiisopropylethylamineHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 183324491-Methylcyclobutan-1-amine hydrochlorideHCID 900796681-[6-(Ethoxycarbonyl)-6-azaspiro[3.4]oct-2-yl]piperidine-4-carboxylic acid

Product 1

HCID 73388391Ethyl 2-{4-[(1-methylcyclobutyl)carbamoyl]piperidin-1-yl}-6-azaspiro[3.4]octane-6-carboxylateYield 35.5%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

1-[6-(Ethoxycarbonyl)-6-azaspiro[3.4]oct-2-yl]piperidine-4-carboxylic acid (0.368 g, 1.10 mmol) was dissolved in DMF (8 mL) and (1-methylcyclobutyl)amine hydrochloride (0.200 g, 1.64 mmol), HATU (0.458 g, 1.21 mmol) and DIPEA (0.708 g, 5.45 mmol) were added. The reaction mixture was stirred at rt overnight under nitrogen. The solvents were removed in vacuo, and the residue was partitioned between DCM and sat. NaHCO3 sol., organic layer washed with sat. NaCl sol. and dried over MgSO4. The solvents were removed in vacuo, and the residue was purified by column chromatography (normal phase, [Biotage SNAP cartridge KP-sil 25 g, 40-63 μm, 60 A, 12 mL per min, gradient 1% to 8% MeOH in DCM]) to give ethyl 2-{4-[(1-methylcyclobutyl)carbamoyl]piperidin-1-yl}-6-azaspiro[3.4]octane-6-carboxylate isomer 2 (0.147 g, 35.5%) as a white foam.

Workup

  1. customThe solvents were removed in vacuo
  2. customthe residue was partitioned between DCM and sat. NaHCO3 sol., organic layer
  3. washwashed with sat. NaCl sol.
  4. dry with materialdried over MgSO4
  5. customThe solvents were removed in vacuo
  6. customthe residue was purified by column chromatography (normal phase, [Biotage SNAP cartridge KP-sil 25 g, 40-63 μm, 60 A, 12 mL per min, gradient 1% to 8% MeOH in DCM])

Sources & evidence

ORD record
ord-f7eec8d33fd146818900dccf70bd41b3
Source dataset
uspto-grants-2016_02
Patent number
US09266857B2

Reaction notes

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