Malononitrile → HCID 10716447, compound

Participants

Reaction Steps

To a solution of malononitrile (0.71 g; 10.6 mmol) in mixture of THF (30 mL) and HMPA (20 mL) was added sodium hydride 60% (0.43 g; 10.6 mmol) and stirred for min. To this mixture was added a solution of methyl (2R)-3-iodo-2-(tritylamino)propanoate CIII (5.0 g; 10.6 mmol) in THF (52 mL) and stirred overnight at r.t. The reaction was quenched with saturated aqueous ammonium chloride and extracted with diethyl ether (5×). The combined organic layers were washed with saturated aqueous ammonium chloride and dried over anhydrous MgSO4. The solvent was removed and the residue was purified on a silica gel column (3:1 hexane/EtOAc) and then crystallized from hexane/EtOAc to give the methyl (2S)-4,4-dicyano-2-(tritylamino)butanoate CIV (2.62 g; 6.4 mmol; 60% yield). 1H NMR (CDCl3) 3.02-3.06 (m, 1H), 2.70-2.75 (m, 1H), 2.81-2.86 (m, 1H), 2.95 (dd, J=12 Hz, J=6 Hz, 1H), 3.76 (s, 3H), 4.51 (d, J=6 Hz, 1H), 7.23 (t, J=8 Hz, 3H), 7.32 (dd, J=8 Hz, J=8 Hz, 6H), 7.43 (d, J=8 Hz, 6H); ESIMS found for C26H23N3O2 m/z 432.3 (M+Na).

Provenance & Evidence