Diisopropylethylamine → Rac-trans-tert-butyl ((1-(5-(4-fluorophenyl)-2-methylthiazole-4-carbonyl)-3-methylpiperidin-2-yl)methyl)carbamate

Participants

Reaction Steps

To a solution of rac-trans-tert-butyl ((3-methylpiperidin-2-yl)methyl)carbamate (37 mg, 162 μmol) from the previous step in DMF was added DIPEA (85 μl, 486 μmol) followed by 5-(4-fluorophenyl)-2-methylthiazole-4-carboxylic acid (57 mg, 243 μmol) and HATU (123 mg, 324 μmol). The reaction was allowed to stir at rt for 15 h, and was then concentrated in vacuo to remove the DMF. The crude residue was taken up in EtOAc and washed with sat aq. NaHCO3, brine, dried (MgSO4), and concentrated. The crude residue was purified by chromatography on silica gel (EtOAc/hexanes) to give rac-trans-tert-butyl ((1-(5-(4-fluorophenyl)-2-methylthiazole-4-carbonyl)-3-methylpiperidin-2-yl)methyl)carbamate as a light yellow oil. To a solution of this carbamate in DCM was added TFA (1:1 v/v). The reaction was aged at rt. When analytical reverse-phase HPLC indicated disappearance of starting material, the reaction was concentrated in vacuo. The crude residue was taken up in EtOAc, and washed with satd. aq. NaHCO3, brine, dried (MgSO4), and concentrated to afford the title compound as a pale yellow oil (34 mg, 60%). MS (ESI) 348.2 (M+H).

Provenance & Evidence