反应详情

To a stirred solution of 35.3 g (94.5 mmole) of N-[(1,1-dimethylethoxy)carbonyl]-3-cyclohexyl-(L)-alanine phenylmethyl ester in 100 mL of dichloromethane at 17° C. is added 100 mL of trifluoroacetic acid over 15 minutes during which time the reaction mixture temperature rises to 21° C. The reaction mixture is stirred overnight, then is concentrated in vacuo. The residue is azeotroped with dichloromethane, toluene and methyl tert-butyl ether. The resulting oil is subjected to high vacuum to afford 3-cyclohexyl-(L)-alanine phenylmethyl ester trifluoroacetate (32.6 g). MS (ion spray) m/z 262 (M+H)+.

1. customrises to 21° C
2. concentrationis concentrated in vacuo
3. customThe residue is azeotroped with dichloromethane, toluene and methyl tert-butyl ether