Piperidine → (S)-2-amino-6-((2-tert-butoxy-2-oxoethyl)(thiazol-2-ylmethyl)amino)hexanoic acid

Participants

Reaction Steps

Piperidine (0.20 mL) was added to a solution of (S)-1-(9H-fluoren-9-yl)-14,14-dimethyl-3,12-dioxo-10-(thiazol-2-ylmethyl)-2,13-dioxa-4,10-diazapentadecane-5-carboxylic acid (72.5 mg, 0.125 mmol) in DMF (1.0 mL). The mixture was stirred at room temperature for 2 hrs. Solvent was evaporated under reduce pressure to afford a residue, which was purified by flash chromatography over silica gel to afford (S)-2-amino-6-((2-tert-butoxy-2-oxoethyl)(thiazol-2-ylmethyl)amino)hexanoic acid (25 mg, 35%). 1H NMR (400 MHz, CD3OD) 7.70 (d, J=3.6 Hz, 1H), 7.53 (d, J=3.2 Hz, 1H), 4.15 (s, 2H), 3.52 (dd, J=7.2, 5.2 Hz, 1H), 3.38 (s, 2H), 2.73 (t, J=7.2 Hz, 2H), 1.91-1.76 (m, 2H), 1.60-1.44 (m, 13H); MS (ESI), 358 (M+H)+.

Provenance & Evidence