反应详情

温度

0 °C

Diethyl azodicarboxylate (349 mg, 2.0 mmol) was added to a solution of 2-chlorobenzenesulfonic acid 3-hydroxy-5-methylphenyl ester (600 mg, 2.0 mmol), as prepared in the preceding step, N-tert-butoxylcarbonyl-4-piperidinemethanol (430 mg, 2.0 mmol), as prepared in step. (b), and triphenylphosphine (525 mg, 2.0 mmol) in tetrahydrofuran (15 mL) at 0° C. The reaction mixture was stirred at 0° C. for 2 H and at room temperature for 3 h. The reaction mixture was quenched with water (50 mL) and was extracted with ethyl acetate (3×50 mL). The organic phase was washed with saturated NaHCO3 (2×50 mL), brine (2×50 mL) and dried over NA2SO4. The solvent removed in vacuo and the residue was purified by flash column chromatography (2:1 ethyl acetate/hexane) to give the title compound as a colorless syrup (895 mg, 90%).

1. customas prepared in step
2. customat 0° C
3. customThe reaction mixture was quenched with water (50 mL)
4. extractionwas extracted with ethyl acetate (3×50 mL)
5. washThe organic phase was washed with saturated NaHCO3 (2×50 mL), brine (2×50 mL)
6. customdried over NA2SO4
7. customThe solvent removed in vacuo
8. customthe residue was purified by flash column chromatography (2:1 ethyl acetate/hexane)