Hydrochloric Acid → 9-Bromo-10-fluoro-3,4,7,8-tetrahydro-[1,4]diazepino[7,1-a]isoquinoline-2,5-dione

Participants

Reaction Steps

methyl 2-(5-bromo-2-(2-((tert-butoxycarbonyl)amino)acetyl)-6-fluoro-1,2,3,4-tetrahydroisoquinolin-1-yl)acetate. To a stirred solution of methyl 2-(5-bromo-6-fluoro-1,2,3,4-tetrahydroisoquinolin-1-yl)acetate (41.58 g, 138 mmol), Boc-glycine (26.5 g, 151 mmol) and triethylamine (38.4 mL, 275 mmol) in AcOEt (690 mL), T3P (98 mL, 165 mmol, 50% m/m in AcOEt) was added and the solution was stirred at RT for 1 h. 0.2N aqueous HCl (200 mL) was added and the reaction mixture was stirred for 5 min. The organic layer was separated and washed with 0.2N aqueous HCl (1×200 mL), saturated aqueous NaHCO3 (2×200 mL) and brine (1×200 mL). The combined organic layers were dried with sodium sulfate, filtered and the solvent was removed under reduced pressure. The residue was dried under high vacuo overnight to yield the title compound as white foam (62.6 g) which was used without further purification. UPLC-MS: MS 459.3/461.3 (M+H+); UPLC rt 1.13 min.

Provenance & Evidence