反应详情

A solution of 56.0 g (203 mmol) of 4-benzoyloxy-1-oxyl-2,2,6,6-tetramethylpiperidine, 125 ml of chlorobenzene, and 58.9 g of t-butyl iodide is cooled to 5° C. Tri-n-butyltin hydride (29 g, 100 mmol) is added dropwise over 110 minutes while the temperature is maintained below 20° C. The reaction mixture is concentrated at reduced pressure and then purified by silica gel chromatography (200:1, then 100:3 heptane:ethyl acetate) to afford 30.1 g of a white solid, m.p. 80°-82.5° C.

1. temperatureis maintained below 20° C
2. concentrationThe reaction mixture is concentrated at reduced pressure
3. custompurified by silica gel chromatography (200:1