Imidazole → HCID 67506454, compound

Participants

Reaction Steps

A mixture of Compound 10 (1.33 g, 3.06 mmol) and imidazole (2.09, 30.70 mmol) was dissolved in anhydrous DMF (11.4 mL). To this solution tert-butyldimethylsilyl chloride (2.31 g, 15.33 mmol) was added with stirring at room temperature for 16 h under an atmosphere of argon. The reaction mixture was diluted with EtOAc (75 mL) and washed with saturated aqueous NaHCO3 (2×60 mL) and brine (50 mL), dried over Na2SO4, filtered and concentrated. The residue obtained was dissolved in methanolic ammonia (20 mL, 7 M) and stirred for 24 h at 55° C. The solvent was removed under reduced pressure and the residue was purified by silica gel column chromatography and eluted with 50% EtOAc in hexanes to yield Compound 11 (1.21 g, 89%). ES MS m/z 455.2 [M+H]+.

Provenance & Evidence