Pyridine → Methyl 2-(6-([1,1'-biphenyl]-4-yl)-4-(4-fluorophenyl)-2-isopropyl-8,8-dimethyl-5,6,7,8-tetrahydro-1,6-naphthyridin-3-yl)-2-(tert-butoxy)acetate

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Reaction Steps

A mixture of Cu(OAc)2 (16.42 mg, 0.090 mmol) and pyridine (7 μl, 0.09 mmol) in CH2Cl2 (1 mL) was stirred for 5 min. Added to this were methyl 2-(tert-butoxy)-2-(4-(4-fluorophenyl)-2-isopropyl-8,8-dimethyl-5,6,7,8-tetrahydro-1,6-naphthyridin-3-yl)acetate (intermediate 5) (20 mg, 0.045 mmol), 4-biphenylboronic acid (17.90 mg, 0.09 mmol) and 34 mg molecular sieves. After stirring uncovered for 18 h, the mixture was adsorbed directly onto silica gel and was purified by flash column chromatography (Biotage; 0%-50% EtOAc/hexane) to give methyl 2-(6-([1,1′-biphenyl]-4-yl)-4-(4-fluorophenyl)-2-isopropyl-8,8-dimethyl-5,6,7,8-tetrahydro-1,6-naphthyridin-3-yl)-2-(tert-butoxy)acetate (22.7 mg, 84% yield) as a colorless oil. LCMS (M+H) calcd for C38H44FN2O3: 595.33. found: 595.4. 19F NMR (500 MHz, Methanol d4) δ ppm: −113.055.

Provenance & Evidence