p-Toluenesulfonic acid → HCID 67054623, compound

HRID 490068Notes

Reaction equation

[CH2:1]([O:8][C:9]1[CH:14]=[CH:13][C:12]([CH2:15][CH2:16][C:17]([NH:33][C:34]([O:36][C:37]([CH3:40])([CH3:39])[CH3:38])=[O:35])([CH2:31][OH:32])[CH2:18][O:19][C:20](=[O:30])[C:21]2[CH:26]=[CH:25][CH:24]=[CH:23][C:22]=2[N+:27]([O-:29])=[O:28])=[CH:11][CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.CO[C:43](OC)([CH3:45])[CH3:44].C1(C)C=CC(S(O)(=O)=O)=CC=1>C1(C)C=CC=CC=1>[C:37]([O:36][C:34]([N:33]1[C:17]([CH2:16][CH2:15][C:12]2[CH:11]=[CH:10][C:9]([O:8][CH2:1][C:2]3[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=3)=[CH:14][CH:13]=2)([CH2:18][O:19][C:20](=[O:30])[C:21]2[CH:26]=[CH:25][CH:24]=[CH:23][C:22]=2[N+:27]([O-:29])=[O:28])[CH2:31][O:32][C:43]1([CH3:45])[CH3:44])=[O:35])([CH3:40])([CH3:39])[CH3:38]

Participants

Conditions

Temperature: 95 °C

Procedure

To a solution of 2-nitro-benzoic acid 4-(4-benzyloxy-phenyl)-2-tert-butoxycarbonylamino-2-hydroxymethyl-butyl ester (105 mg, 0.19 mmol) in toluene (2 ml) is added 2,2 dimethoxypropane (0.06 ml, 0.57 mmol, 3 eq) and a catalytic amount of p-toluene sulfonic acid. The reaction mixture is stirred at 95° C. for 6 hours, then concentrated to dryness under negative pressure. 4-[2-(4-Benzyloxy-phenyl)ethyl]-2,2-dimethyl-4-(2-nitro-benzoyloxy-methyl)-oxazolidine-3-carboxylic acid tert-butyl ester is isolated as an oil (88 mg, 78%) after purification by flash chromatography (Ethyl acetate/Hexane (1/3)).

Workup

concentrationconcentrated to dryness under negative pressure

Sources & evidence

ORD record: ord-e35727c7dc3f48858538f355ea603552
Source dataset: uspto-grants-2009_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07528120B2

Reaction notes

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