反応 #577250

反応方程式

p-toluene sulfonic acid

2-nitro-benzoic acid 4-(4-benzyloxy-phenyl)-2-tert-butoxycarbonylamino-2-hydroxymethyl-butyl ester

2,2 dimethoxypropane

→

4-[2-(4-Benzyloxy-phenyl)ethyl]-2,2-dimethyl-4-(2-nitro-benzoyloxy-methyl)-oxazolidine-3-carboxylic acid tert-butyl ester

溶媒

toluene

反応条件

後処理

1. 1
   濃縮concentrated to dryness under negative pressure

実験手順

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)).

出典