Imidazole → (R)-4-bromo-3-(2-((tert-butyldiphenylsilyl)oxy)-1-hydroxyethyl)-1H-isochromen-1-one

Participants

Reaction Steps

A solution of 4-bromo-3-[(1R)-1,2-dihydroxyethyl]-1H-2-benzopyran-1-one (145 mg, 0.509 mmol) and imidazole (51.9 mg, 0.763 mmol) in N,N-Dimethylformamide (DMF) (2.4 mL) was treated with tert-butyldiphenylchlorosilane (159 μl, 0.610 mmol). After 20 min, the reaction mixture was poured into water and extracted with EtOAc. The organic phase was dried with Na2SO4, filtered and concentrated. The residue was purified by silica gel chromatography (ethyl acetate-hexanes 0-50%) to afford the title compound (169 mg, 0.323 mmol, 64% yield) as a white foam: Rt=1.24 min, ES+ MS: 546 (M+23).

Provenance & Evidence