1,2-Dichloroethane → HCID 44349222, compound

Participants

Reaction Steps

To a solution of (3S)-3-[(4-chlorophenyl)methyl]-4-(4-{2-[(cyclopropylmethyl)(methylsulfonyl)amino]phenyl}-piperazinyl)-4-oxobutanoic acid (Step 6) (0.63 g, 0.97 mmol), tert-butyl piperazinecarboxylate (0.272 g, 1.46 mmol), HOBt (0.131 g, 0.97 mmol) and TEA (0.135 mL, 0.97 mmol) in 10 mL of CH2Cl2 at 0° C. was added EDC (0.28 g, 1.46 mmol). The reaction was warmed to RT and stirred for 12 h. The reaction was quenched with satd. NaHCO3, and extracted with 50 mL of EtOAc. The organic phase was washed with brine, dried over Na2SO4 and concentrated in vacuo. The crude compound was further purified by silica gel column chromatography (EtOAc) to afford tert-butyl 4-[(3S)-3-[(4-chlorophenyl)methyl]-4-(4-{2-[(cyclopropylmethyl)(methylsulfonyl)amino]-phenyl}piperazinyl)-4-oxobutanoyl]piperazinecarboxylate as a white foam (0.3 g). MS (ESI, pos. ion) m/z: 702.5 (M+1). Calc'd for C35H48ClN5O6S: 701.30. Anal. Calc'd for C35H48ClN5O6S.0.5H2O: C, 59.10; H, 6.94; N. 9.85; Cl, 4.98. Found: C, 59.32; H, 6.94; N, 9.81; Cl, 5.17.

Provenance & Evidence