To a stirred solution of 4-benzyl-5-oxomorpholine-3-carboxylic acid (Organic and Bio-Organic Chemistry (1972-1999); (1985); 2577-2580) (500 mg, 2.12 mmole) in dichloromethane (15 mL), HOBt (430 mg, 3.19 mmole) and DIPC (287 μL, 3.19 mmole) were added at room temperature. The reaction mixture was stirred for 15 min, then (R)-1-(naphthalen-1-yl)ethanamine (400 μL, 2.57 mmole) was added to the reaction mixture and stirred overnight. Solid separated out was filtered, washed with dichloromethane (2×15 mL), filtrate collected and washed with brine solution (2×15 mL) and DM water. The organic layer was concentrated to get crude amide and which was further purified by flash chromatography (n-Hexane:ethyl acetate, 8:3) to get title compound (500 mg). m/z 389.2
