Triethylamine → Tert-butyl 4-(6-hydroxybenzo[d]oxazole-2-carboxamido)piperidine-1-carboxylate

HRID 539817Notes

Reaction equation

HRID 539817 reaction equation
[OH:1][C:2]1[CH:13]=[CH:12][C:5]2[N:6]=[C:7]([C:9]([OH:11])=O)[O:8][C:4]=2[CH:3]=1.C(N(CC)CC)C.O.ON1C2C=CC=CC=2N=N1.Cl.CN(C)CCCN=C=NCC.[NH2:44][CH:45]1[CH2:50][CH2:49][N:48]([C:51]([O:53][C:54]([CH3:57])([CH3:56])[CH3:55])=[O:52])[CH2:47][CH2:46]1>CN(C)C=O>[OH:1][C:2]1[CH:13]=[CH:12][C:5]2[N:6]=[C:7]([C:9]([NH:44][CH:45]3[CH2:46][CH2:47][N:48]([C:51]([O:53][C:54]([CH3:57])([CH3:56])[CH3:55])=[O:52])[CH2:49][CH2:50]3)=[O:11])[O:8][C:4]=2[CH:3]=1

Participants

7

Reactant 5

HCID 8471TriethylamineHCID 12682914-Amino-1-Boc-piperidineHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochlorideHCID 27960291-Hydroxybenzotriazole hydrateHCID 579510576-Hydroxybenzo[d]oxazole-2-carboxylic acid

Product 1

HCID 57951081Tert-butyl 4-(6-hydroxybenzo[d]oxazole-2-carboxamido)piperidine-1-carboxylateYield 52%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a stirred mixture of 6-hydroxybenzo[d]oxazole-2-carboxylic acid (0.15 g, 0.86 mmol) in anhydrous N,N-dimethylformamide (2 mL) was added triethylamine (0.10 g, 0.99 mmol), 1-hydroxybenzotriazole hydrate (0.14 g, 0.99 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.20 g, 0.99 mmol), and tert-butyl 4-aminopiperidine-1-carboxylate (0.20 g, 0.99 mmol). The mixture was stirred at room temperature overnight and then concentrated under reduced pressure. The residue obtained was purified by flash chromatography (silica gel, ethyl acetate/hexanes=1/1) to afford tert-butyl 4-(6-hydroxybenzo[d]oxazole-2-carboxamido)piperidine-1-carboxylate as a off-white solid (0.16 g, 52%). 1H-NMR (DMSO-d6, 300 MHz): δ 10.10 (s, 1H), 9.04 (m, 1H), 7.63 (m, 1H), 7.10 (m, 1H), 7.27 (m, 5H), 6.91 (m, 1H), 3.92 (m, 3H), 2.78 (m, 2H), 1.72 (m, 2H), 1.49 (m, 2H), 1.38 (s, 9H); MS (ESI): 362.1 (M+1).

Workup

  1. concentrationconcentrated under reduced pressure
  2. customThe residue obtained
  3. customwas purified by flash chromatography (silica gel, ethyl acetate/hexanes=1/1)

Sources & evidence

ORD record
ord-b85e774c8395470aaf20e51491fb9046
Source dataset
uspto-grants-2014_10
Patent number
US08871770B2

Reaction notes

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