反应详情

Following Step 6 in Scheme 47, using (+/−)-4-(6-amino-5-bromopyridin-3-yl)-1-methylpiperidin-2-one and (S)-(4-((1-(3-chlorophenyl)-2-hydroxyethyl)carbamoyl)-3-fluorophenyl)boronic acid, 4-(2-amino-5-(1-methyl-2-oxopiperidin-4-yl)pyridin-3-yl)-N—((S)-1-(3-chlorophenyl)-2-hydroxyethyl)-2-fluorobenzamide was obtained as a diastereomeric mixture (inseparable) (35%). LCMS (m/z): 497.3 (MH+), 0.59 min; 1H NMR (400 MHz, CD3OD) δ ppm 7.97 (m, 1H), 7.9 (m, 1H), 7.82 (m, 1H), 7.52-7.39 (m, 3H), 7.39-7.32 (m, 2H), 7.3 (m, 1H), 5.19 (m, 1H), 3.88 (m, 2H), 3.60-3.38 (m, 3H), 3.21-3.08 (m, 1H), 2.72-2.58 (m, 1H), 2.57-2.41 (m, 1H), 2.21-1.95 (m, 2H). The diastereomeric mixture was separated by chiral SFC (ChiralPak 5mic AD column, 4.6×100 (mm), 5 mL/min, EtOH+0.1%, DEA=45% in 5 min). The polar diastereomer, 4-(2-amino-5-((R)-1-methyl-2-oxopiperidin-4-yl)pyridin-3-yl)-N—((S)-1-(3-chlorophenyl)-2-hydroxyethyl)-2-fluorobenzamide was obtained at Rt=1.82 min. The less polar diastereomer, 4-(2-amino-5-((S)-1-methyl-2-oxopiperidin-4-yl)pyridin-3-yl)-N—((S)-1-(3-chlorophenyl)-2-hydroxyethyl)-2-fluorobenzamide was obtained at Rt=2.35 min. The absolute stereochemistry for both diastereomers was assigned arbitrarily.