反应详情

Following Step 6 in Scheme 47, using (+/−)-4-(6-amino-5-bromopyridin-3-yl)-1-methylpiperidin-2-one and (R)-(3-fluoro-4-((1-phenylethyl)carbamoyl)phenyl)boronic acid, 4-(2-amino-5-(1-methyl-2-oxopiperidin-4-yl)pyridin-3-yl)-2-fluoro-N—((R)-1-phenylethyl)benzamide was obtained as a diastereomeric mixture (inseparable) (34%). LCMS (m/z): 447.3 (MH+), 0.58 min; 1H NMR (400 MHz, CD3OD) δ ppm 7.85 (m, 1H), 7.72 (m, 2H), 7.41-7.20 (m, 6H), 7.18 (m, 1H), 5.17 (m, 1H), 3.51-3.29 (m, 3H), 3.13-2.98 (m, 1H), 2.88 (s, 3H), 2.60-2.48 (m, 1H), 2.48-2.30 (m, 1H), 2.10-1.85 (m, 2H), 1.58-1.38 (m, 3H). The diastereomeric mixture was separated by chiral SFC (ChiralPak 5mic AD column, 4.6×100 (mm), 100 mL/min, IPA+0.1%, DEA=40%, 5 ml/min). The polar diastereomer, 4-(2-amino-5-((R)-1-methyl-2-oxopiperidin-4-yl)pyridin-3-yl)-2-fluoro-N—((R)-1-phenylethyl)benzamide was obtained at Rt=1.67 min. LCMS (m/z): 447.3 (MH+), 0.64 min. The less polar diastereomer, 4-(2-amino-5-((S)-1-methyl-2-oxopiperidin-4-yl)pyridin-3-yl)-2-fluoro-N—((R)-1-phenylethyl)benzamide was obtained at Rt=2.37 min. LCMS (m/z): 447.2 (MH+), 0.64 min. The absolute stereochemistry for both diastereomers was assigned arbitrarily.