反应详情

Sodium hydride (44.9 mg, 1.87 mmol) was added to a solution of 5-hydroxy-2-[(phenylmethyl)oxy]-N-3-pyridinylbenzamide (may be prepared as described in Example 29; 500 mg, 1.56 mmol) in dimethylsulfoxide (8 ml) at 0° C., and the mixture was stirred at room temperature for 1 h. 1,1-Dimethylethyl (2R)-2-({[(4-chlorophenyl)sulfonyl]oxy}methyl)-1-pyrrolidinecarboxylate (555 mg, 1.56 mmol) in dimethylsulfoxide (7 ml) was added dropwise, and the mixture was stirred at 75° C. for 18 h. The mixture was poured into water (100 ml) and extracted with ethyl acetate. The organic layer was dried, and concentrated to obtain a crude product, which was purified by chromatography on silica gel (dichloromethane/methanol=50:1) to yield the title compound as a yellow oil. 0.55 g.

1. stirringthe mixture was stirred at 75° C. for 18 h
2. extractionextracted with ethyl acetate
3. customThe organic layer was dried
4. concentrationconcentrated
5. customto obtain a crude product, which
6. customwas purified by chromatography on silica gel (dichloromethane/methanol=50:1)