p-Toluenesulfonic acid → HCID 67054623, compound

Participants

Reaction Conditions

Reaction Steps

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)).

Provenance & Evidence