反应详情

Add dropwise 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) drop wise (8.76 mL, 56.92 mmol) to a solution of 4′-bromo-biphenyl-2-ylamine (3.53 g, 14.23 mmol) in dichloromethane (50 ml) at 0° C., followed by drop wise addition of isopropylsulfonyl chloride (3.29 mL, 28.46 mmol) and stir the reaction at room temperature for 24 h. Remove solvent under reduce pressure and purify the residue by silica and eluting with ethyl acetate:hexane 1:4 to ethyl acetate to provide the title compound (4.93 g, 98%): Mass spectrum (m/e): 355 (M+1); 353 (M−1); 1HNMR (CDCl3) δ 1.24 (d, 6H, J=6.7 Hz); 3.28 (sep, 1H, J=6.9 Hz); 6.22 (s, 1H); 7.12-7.41 (m, 5H); 7.55-7.68 (m, 3H).

1. customthe reaction at room temperature for 24 h
2. custompurify the residue by silica
3. washeluting with ethyl acetate:hexane 1:4 to ethyl acetate