反应详情

A solution of 0.382 g of benzyl 4-[4-(azetidin-3-yloxy)phenyl]-3-[4-(3-methoxypropyl)-3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-6-ylmethoxy]piperidine-1-carboxylate in 10 ml of chloroform is admixed at 0-5° C. with 0.156 ml of 2-chlorobenzoxazole. The reaction solution is stirred at room temperature over 20 hours and subsequently poured onto an ice-water mixture. The reaction mixture is extracted with ethyl acetate (2×50 ml) and the combined organic phases are washed with 50 ml of brine, dried over sodium sulphate, filtered and concentrated. The title compound is obtained as a colourless oil from the residue by means of flash chromatography (SiO2 60F). Rf=0.20 (2:1 EtOAc-heptane); Rt=4.99.

1. extractionThe reaction mixture is extracted with ethyl acetate (2×50 ml)
2. washthe combined organic phases are washed with 50 ml of brine
3. dry with materialdried over sodium sulphate
4. filtrationfiltered
5. concentrationconcentrated