反应详情

A solution of tert-butyl 5-(hydroxymethyl)-6-fluoro-1H-indazole-1-carboxylate (29F, 3.0 g, 11.27 mmol) in methylene chloride (50.00 mL, 780.0 mmol) at room temperature. was treated with pyridine (4.56 mL, 56.33 mmol) and methanesulfonyl chloride (1.31 mL) and stirred at room temperature for 16 hours. The reaction mixture was concentrated in vacuo and the residue was dissolved in EtOAc (300 mL) washed with aq HCl (100 mL), brine (100 mL), dried (MgSO4), filtered, concentrated in vacuo, and purified using chromatography (SiO2, EtOAc/Hexanes) to provide tert-butyl 5-(chloromethyl)-6-fluoro-1H-indazole-1-carboxylate (24G, 1.9 g; Yield=59%)

1. customat room temperature
2. concentrationThe reaction mixture was concentrated in vacuo
3. dissolutionthe residue was dissolved in EtOAc (300 mL)
4. washwashed with aq HCl (100 mL), brine (100 mL)
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. custompurified