Piperazin-2-one → HCID 19025734, compound

Participants

Reaction Steps

To the resultant compound from Example 11C (320.5 mg, 0.908 mmol) in dichloromethane (5 mL) at -10° C. was added 2-oxopiperazine (140 mg, 1.40 mmol, Yu et al. J. Med. Chem. 1900, 31, 1435) in pyridine (2 mL). After 30 min at -10° C. and 30 min at ambient temperature, the solvent was evaporated and the residue was partitioned between ether and 0.5 M H3PO4. The organic layer was washed with 0.5 M H3PO4, saturated NaHCO3 solution and brine, and then was dried over MgSO4 and evaporated. Chromatography of the residue on silica gel with 2% methanol in chloroform afforded 237.1 mg (63%) of the desired product as a foam: TLC (5% methanol/95% chloroform) Rf =0.26; 1H NMR (CDCl3) 7.43-7.07 (m, 10H), 5.97 (br, 1H), 5.12 (d, 1H), 5.08 (d, 1H), 3.82 (d, 1H), 3.78 (d, 1H), 3.55 (dd, 1H), 3.43-3.17 (m, 5H), 3.07 (dd, 1H), 3.01 (dd, 1H), 2.87 (dd, 1H).

Provenance & Evidence