反应详情

A mixture of D4 (149 mg, 0.438 mmol) and 1,1-dimethylethyl (2R,6S)-2,6-dimethyl-1-piperazinecarboxylate (94 mg, 0.438 mmol) in 1,2-DCE (3 ml) was stirred for 5 mins at room temperature. Sodium tri(acetoxy)borohydride (139 mg, 0.66 mmol) was added and the mixture was stirred for 3 h then saturated aq. NaHCO3 solution was added. The mixture was stirred for 15 mins then extracted with EtOAc. The combined extracts were dried (Na2SO4) and concentrated in vacuo to give the crude product which was purified by chromatography. Elution with 20-90% EtOAc/pentane gave 1,1-dimethylethyl (2R,6S)-4-{[4-(2-{4-[(4-fluorophenyl)amino]-1-piperidinyl}-2-oxoethyl)phenyl]methyl}-2,6-dimethyl-1-piperazinecarboxylate (143 mg). δH (CDCl3, 400 MHz) 1.06 (1H, m), 1.27 (6H, d), 1.30 (1H, m), 1.46 (9H, s), 1.93 (1H, m), 2.05 (1H, m), 2.12 (2H, dd), 2.59 (2H, d), 2.88 (1H, m), 3.13 (1H, m), 3.29 (1H, m), 3.38 (1H, m), 3.45 (2H, s), 3.74 (2H, s), 3.86 (1H, m), 4.07 (2H, m), 4.50 (1H, m), 6.50 (2H, m), 6.87 (2H, t), 7.20 (2H, m), 7.31 (2H, d). MS (ES): MH+ 539

1. stirringthe mixture was stirred for 3 h
2. stirringThe mixture was stirred for 15 mins
3. extractionthen extracted with EtOAc
4. dry with materialThe combined extracts were dried (Na2SO4)
5. concentrationconcentrated in vacuo
6. customto give the crude product which
7. customwas purified by chromatography
8. washElution with 20-90% EtOAc/pentane