Hydrochloric Acid → HCID 89668555, compound

Participants

Reaction Steps

A solution of (R)-2-(allyloxycarbonylamino)-3-(tert-butyldisulfanyl)propanoic acid (Alloc-Cys(StBu)-OH) (1.9 g, 6.48 mmol) and N-hydroxysuccinimide (0.745 g, 6.48 mmol) in dichloromethane (10 ml) was cooled to 0° C., after which 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC.HCl, 1.24 g, 6.48 mmol) was added and the reaction solution was stirred at room temperature for 20 hours. After 20 hours, the reaction solution was cooled to 0° C., after which N,N-diisopropylethylamine (2.49 ml, 14.25 mmol) and Fmoc-Lys-OH (2.39 g, 6.48 mmol) were added and the reaction solution was stirred at room temperature for 2 hours. Dichloromethane and 1 M hydrochloric acid were added to the reaction mixture, followed by extraction with dichloromethane. The organic layer was washed with 25 wt % brine, the resulting solution was concentrated under reduced pressure, and the concentration residue was purified by reverse-phase silica gel column chromatography (0.1% aqueous formic acid solution/0.1% formic acid-acetonitrile solution) to afford (S)-2-(((9H-fluoren-9-yl)methoxy)carbonylamino)-6-((R)-2-(allyloxycarbonylamino)-3-(tert-butyldisulfanyl)propanamido)hexanoic acid (Compound 150a, Fmoc-Lys(Alloc-Cys(StBu))-OH) (2.66 g, 64%).

Provenance & Evidence