反应详情

To a solution of 2-(3-bromophenyl)-2-(tert-butoxycarbonyl) propanoic acid (11.3 g, 32.8 mmol) in MeOH (35 mL) was added toluene (175 mL) followed by TMSCHN2 (2M in hexane, 44 mL, 98 mmol, 3 eq). The mixture was stirred at RT for 16 h. Solvents were evaporated and the residue was chromatographed on silica by eluting with EtOAc/hexanes to give 11.8 g (100%) of methyl 2-(3-bromophenyl)-2-(tert-butoxycarbonyl)propanoate as a yellow oil. 1H NMR (CDCl3) 7.59 (t, J=1.8 Hz, 1H), 7.36-7.44 (m, 2H), 7.21 (t, J=8.0 Hz, 1H), 5.92 (s, 1H), 3.70 (s, 3H), 1.97 (s, 3H), 1.36 (br s, 9H).

1. customSolvents were evaporated
2. customthe residue was chromatographed on silica
3. washby eluting with EtOAc/hexanes