Nitrogen → (R)-3-(2-((tert-butyldiphenylsilyl)oxy)-1-hydroxyethyl)-4-(3,4-dimethylphenyl)-1H-isochromen-1-one

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A solution of 4-bromo-3-((1R)-2-{[(1,1-dimethylethyl)(diphenyl)silyl]oxy}-1-hydroxyethyl)-1H-2-benzopyran-1-one (142 mg, 0.271 mmol) and 3,4-dimethylphenylboronic acid (61.0 mg, 0.407 mmol) in N,N-Dimethylformamide (DMF) (2.5 mL) was degassed with N2 for 10 min. The reaction mixture was treated with 2M Na2CO3 (149 μl, 0.298 mmol) and Pd(PPh3)4 (16 mg, 0.014 mmol) and irradiated in the microwave for 20 min at 120° C. The reaction mixture was diluted with EtOAc, and washed with saturated aqueous NH4Cl, brine, dried (Na2SO4), filtered and concentrated. The residue was purified by silica gel chromatography (ethyl acetate-hexanes 0-30%) to afford the title compound (92 mg, 0.168 mmol, 62% yield) as a white solid: Rt=1.31, 1.33 (atropisomers), ES+ MS: 571 (M+23).

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