Triethylamine → 2-[3-Methoxy-4-(pyrrolidin-1-ylmethyl)phenyl]-1,3-benzoxazole

HRID 7748Notes

Reaction equation

HRID 7748 reaction equation
[NH:1]1[CH2:5][CH2:4][CH2:3][CH2:2]1.Br[CH2:7][C:8]1[CH:13]=[CH:12][C:11]([C:14]2[O:15][C:16]3[CH:22]=[CH:21][CH:20]=[CH:19][C:17]=3[N:18]=2)=[CH:10][C:9]=1[O:23][CH3:24].C(N(CC)CC)C>C(Cl)Cl>[CH3:24][O:23][C:9]1[CH:10]=[C:11]([C:14]2[O:15][C:16]3[CH:22]=[CH:21][CH:20]=[CH:19][C:17]=3[N:18]=2)[CH:12]=[CH:13][C:8]=1[CH2:7][N:1]1[CH2:5][CH2:4][CH2:3][CH2:2]1

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 31268PyrrolidineHCID 219909912-[4-(Bromomethyl)-3-methoxyphenyl]-1,3-benzoxazole

Product 1

HCID 102365762-[3-Methoxy-4-(pyrrolidin-1-ylmethyl)phenyl]-1,3-benzoxazole

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Pyrrolidine (226 μL, 2.83 mmol) was added to a stirring solution of 2-[4-(bromomethyl)-3-methoxyphenyl]-1,3-benzoxazole (300 mg, 0.94 mmol) and triethylamine (390 μL, 2.8 mmol) in CH2Cl2 (5 mL). The mixture was stirred at rt overnight. Crude mixture was adsorbed onto silica gel and purified by automated flash chromatography using an EtOAc/hexanes gradient to afford the desired 2-[3-methoxy-4-(pyrrolidin-1-ylmethyl)phenyl]-1,3-benzoxazole as a colorless solid: 1H NMR (CDCl3, 300 MHz) δ 7.82–7.80 (m, 1H), 7.77–7.74 (m, 1H), 7.71 (s, 1H), 7.56–7.50 (m, 2H), 7.35–7.30 (m, 2H), 3.94 (s, 3H), 3.71 (s, 2H), 2.59 (s, 4H), 1.81–1.78 (m, 4H). MS (ESI) 309 (M+H)+.

Workup

  1. custompurified by automated flash chromatography

Sources & evidence

ORD record
ord-8d727bc8a4d84ea78c9269287c4a100c
Source dataset
uspto-grants-2006_08
Patent number
US07087601B2

Reaction notes

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