[O:1]1[C:9]2[C:4](=[N:5][CH:6]=[CH:7][CH:8]=2)[O:3][CH:2]1[CH2:10][OH:11].C(N(CC)CC)C.[CH3:19][S:20](Cl)(=[O:22])=[O:21]>C(Cl)Cl>[CH3:19][S:20]([O:11][CH2:10][CH:2]1[O:3][C:4]2=[N:5][CH:6]=[CH:7][CH:8]=[C:9]2[O:1]1)(=[O:22])=[O:21]A solution of intermediate (5) (0.018 mol) and triethyl amine (0.036 mol) in DCM (80 ml) was stirred and cooled with an ice-water bath. Methanesulfonyl chloride (0.027 mol) was added dropwise and the resulting reaction mixture was stirred for one hour while cooling on an ice-bath. The crude reaction mixture was washed with water and brine, then extracted. The separated organic layer was dried, filtered and the solvent was evaporated, yielding 4.2 g of (±)-1,3-dioxolo[4,5-b]pyridine-2-methanol methanesulfonate (ester) (intermediate 6).
Wird geladen…
