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 (1 eq) from the previous step in DMF was added DIPEA (2 eq) followed by 5-(4-fluorophenyl)-2-methylthiazole-4-carboxylic acid (1.5 eq) and HATU (2 eq). 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 1M HCl, sat aq. NaHCO3, brine, dried (MgSO4), and concentrated. The crude residue was purified by chromatography on silica gel (EtOAc/hex) to give tert-butyl (((2R,3R)-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 CH2Cl2 was added TFA (1:1 v/v). The reaction was aged at rt and monitored for disappearance of starting material by analytical reverse-phase HPLC. When starting material was consumed, the reaction was concentrated in vacuo. The crude residue was taken up in EtOAc, and washed with sat aqueous NaHCO3, brine, dried (MgSO4), and concentrated to afford the title compound as a pale yellow oil which crystallized. MS (ESI) 348.2 (M+H).

Provenance & Evidence