反应详情

A mixture, under an argon atmosphere, of 2-chloro-4-methyl-3-quinolinemethanol (obtained according to 3.c, 2.08 g, 10 mmol), of tert-butyl3-hydroxy-3-(2-oxo-1,2-dihydro-4-pyridinyl)pentanoate (obtained according to 1.h, 2 g, 11 mmol), and tributylphosphine (2.75 ml, 11 mmol) in anhydrous tetrahydrofuran (40 ml) is treated dropwise with diethyl azodicarboxylate (2.6 ml, 15 mmol). The reaction mixture is then agitated at ambient temperature for 6 hours, then concentrated under reduced pressure. The resulting oily residue is taken up in dichloromethane (200 ml) and washed with saturated aqueous ammonium chloride then with saturated aqueous sodium chloride. The organic phase is dried over sodium sulphate then concentrated to 5 ml and acetonitrile is added in order to obtain a white precipitate which is kept at 4° C. for 16 hours. The precipitate is collected by filtration then washed with isopropyl ether in order to produce 1.8 g (39%) of a white solid.

1. concentrationconcentrated under reduced pressure
2. washwashed with saturated aqueous ammonium chloride
3. dry with materialThe organic phase is dried over sodium sulphate
4. concentrationthen concentrated to 5 ml and acetonitrile
5. additionis added in order
6. customto obtain a white precipitate which
7. waitis kept at 4° C. for 16 hours
8. filtrationThe precipitate is collected by filtration
9. washthen washed with isopropyl ether in order