Cesium carbonate → (R)-6-(3-hydroxypropyl)-3-((S)-1-(4-(1-methyl-6-oxo-1,6-dihydropyridin-3-yl)phenyl)ethyl)-6-phenyl-1,3-oxazinan-2-one

Participants

Reaction Steps

A mixture of (R)-6-(3-hydroxypropyl)-6-phenyl-3-((S)-1-(4-(4,4,5,5-tetramethyl -1,3,2-dioxaborolan-2-yl)phenyl)ethyl)-1,3-oxazinan-2-one (1.7 g, 3.7 mmol) and 5-bromo-1-methylpyridin-2(1H)-one (816 mg, 4.4 mmol), Pd(Ph3P)2Cl2 (200 mg), and aq Cs2CO3 solution (4 mL, 2M) in 1,4-dioxane (30 mL) was stirred and heated to reflux for 2 h. When the reaction was over, the mixture was washed with water and extracted with EtOAc, and the organic phase was washed with brine, dried over Na2SO4, filtered and concentrated to give crude product, which was purified by preparative TLC to give (R)-6-(3-hydroxypropyl)-3-((S)-1-(4-(1-methyl-6-oxo-1,6-dihydropyridin-3-yl)phenyl)ethyl)-6-phenyl-1,3-oxazinan-2-one (614 mg, 37%). LC-MS Method 2 tR=1.075 min, m/z=447.1; 1H NMR (CDCl3): δ=1.38 (m, 1H), 1.47 (d, 3H), 1.73 (m, 2H), 1.98 (m, 2H), 2.20 (m, 1H), 2.31 (m, 2H), 2.94 (m, 1H), 3.51 (m, 2H), 3.56 (s, 3H), 5.63 (m, 1H), 6.67 (m, 1H), 6.87 (m, 2H), 7.05 (m, 2H), 7.31-7.41 (m, 6H), 7.48 (m, 1H).

Provenance & Evidence