反应详情

The acid chloride from step 1 was taken up in DCM (3 mL) and added to 1,1-dimethylethyl (2S)-2-methyl-4-{[4-(methylamino)phenyl]methyl}-1-piperazinecarboxylate (D3) (0.288 g, 0.904 mmol) in DCM (3 mL). Triethylamine (0.251 mL, 1.808 mmol) was added and the mixture was stirred at room temperature overnight. The reaction mixture was diluted with DCM and washed with water. The aqueous was extracted with DCM (×2) and the combined organic layers were dried and concentrated. The crude product was purified by column chromatography. Elution with a 0-50% EtOAc/petroleum ether gradient gave the title compound as a colourless oil (0.518 g). δH (CDCl3, 400 MHz) 8.07 (1H, m), 7.65 (1H, dd), 7.24 (2H, d), 7.03 (6H, m), 6.70 (1H, d), 4.18 (1H, br.s), 3.80 (1H, d), 3.48 (3H, s), 3.46 (1H, d), 3.34 (1H, d), 3.08 (1H, td), 2.70 (1H, d), 2.50 (1H, d), 2.10 (1H, dd), 2.00 (1H, m), 1.46 (9H, s), 1.20 (3H, d). MS (ES): MH+ 535.3.

1. washwashed with water
2. extractionThe aqueous was extracted with DCM (×2)
3. customthe combined organic layers were dried
4. concentrationconcentrated
5. customThe crude product was purified by column chromatography
6. washElution with a 0-50% EtOAc/petroleum ether gradient