Acetonitrile → HCID 131712965, compound

Participants

Reaction Steps

1,1-Carbonyldiimidazole (1.8 g., 0.011 mole) is added to a chilled (0°) solution of the product from part (c) (4.6 g., 0.011 mole) in 50 ml. of acetonitrile. The mixture is stirred for one hour at 0° and a solution of L-proline, benzyl ester (2.3 g., 0.011 mole) in 25 ml. of acetonitrile is added. The mixture is stirred at ambient temperature for 16 hours. The solvent is removed in vacuo. The residue is dissolved in 200 ml. of dichloromethane, washed with 5% potassium bisulfate, saturated sodium bicarbonate solution, brine, and dried (MgSO4). The solvent is removed in vacuo to give an oil residue of 6.5 g. Tlc, silica gel, ethyl acetate, shows a major spot at Rf 0.50 visualized with PMA. The residue is chromatographed on silica gel, eluted with dichloromethane/ethyl acetate (9:1) and (4:1) to give 5.4 g. of (±)-1-[(phenylmethoxy)[1-[(ethoxycarbonyl)amino]-3-phenylpropyl]phosphinyl]acetyl]-L-proline, phenylmethyl ester. Tlc shows a single spot at Rf 0.50.

Provenance & Evidence