Tert-butoxycarbonylalanine → [(S)-1-(5-Fluoro-2-methyl-1,2,3,4-tetrahydroquinolin-8-ylcarbamoyl)ethyl]carbamic acid tert-butyl ester

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Reaction Steps

To the mixture of 5-fluoro-2-methyl-1,2,3,4-tetrahydroquinolin-8-ylamine and 5-fluoro-2-methylquinolin-8-ylamine from the previous step (0.369 mmol) in DCM (10 mL) was added (S)-2-tert-butoxycarbonylaminopropionic acid (76.8 mg, 0.405 mmol) and HOAt (56 mg, 0.41 mmol). The mixture was cooled in an ice bath, then EDCI HCl (85 mg, 0.44 mmol) was added. The reaction mixture was stirred in the ice bath for 2 h, then diluted with DCM, washed with aqueous Na2CO3 and then water. The organic layer was dried (Na2SO4) and then concentrated in vacuo. The resulting residue was purified by column chromatography (Si—PCC, gradient 20-50% EtOAc in cyclohexane) affording the title compound as a colourless solid (63.6 mg, 49%, 2 steps). LCMS (Method J): RT 3.40 min [M+H]+ 352

Provenance & Evidence