反应详情

A solution of borane dimethyl sulfide complex (2M in THF, 12.0 mL) was added portionwise over 3 minutes to a suspension of 3-(carboxymethyl)-4-chlorobenzoic acid [Aromatic Intermediate 1, step a] (2.06 g) in dry THF (30 mL) at room temperature. The resulting effervescing dense suspension was stirred at room temperature for 1 hour, then heated to reflux for 1 hour. The cooled mixture was quenched by the portionwise addition of methanol (10 mL) over 2 minutes. The solution was stirred at room temperature for 30 minutes and then concentrated onto silica and purified by flash chromatography on silica eluted with 5% methanol in dichloromethane to afford the subtitled compound as a white solid. Yield 0.983 g.

1. temperatureheated
2. temperatureto reflux for 1 hour
3. customThe cooled mixture was quenched by the portionwise addition of methanol (10 mL) over 2 minutes
4. stirringThe solution was stirred at room temperature for 30 minutes
5. concentrationconcentrated onto silica
6. custompurified by flash chromatography on silica
7. washeluted with 5% methanol in dichloromethane