Acetonitrile → HCID 131712964, compound

Participants

Reaction Steps

1,1'-Carbonyldiimidazole (1 g. 0.066 mole) is added to a chilled (0°) solution of the product from part (c) (2.5 g., 0.063 mole) in 40 ml. of acetonitrile. The mixture is stirred for one hour at 0°. A solution of L-proline, benzyl ester (1.3 g., 0.066 mole) in 20 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 dichloromethane (125 ml.), washed with 5% potassium bisulfate, saturated sodium bicarbonate solution, brine, and dried (MgSO4). The solution is concentrated in vacuo to give an oil residue of 3.3 g. Tlc, silica gel, ethyl acetate shows a major spot at Rf 0.10. A portion (2.2 g.) is chromatographed on silica gel, eluting with ethyl acetate to give 1.7 g. of (±)-1-[(phenylmethoxy)[1-[[(phenylmethoxy)carbonyl]amino]ethyl]phosphinyl]acetyl]-L-proline, phenylmethyl ester.

Provenance & Evidence