反应详情

To a solution of (S)-tert-butyl 4-(5-(tert-butyldimethylsilyloxy)-4-(3-(2-chloro-3-fluorobenzyl)-1-methylureido)pentanoyl)piperazine-1-carboxylate (4.2 g, 6.8 mmol, 1.0 equiv.) in MeOH (35 mL), was added HCl (2N, 0.68 mL, 1.36 mmol, 0.2 equiv.). The reaction was stirred at RT for 1 h. NaHCO3 (1.1 g, 13.6 mmol, 2.0 equiv) was added to quench the reaction. The solvents were removed. The residue was dissolved in EtOAc (100 mL). The salt was filtered off and the filtrate was concentrated to give (S)-tert-butyl 4-(4-(3-(2-chloro-3-fluorobenzyl)-1-methylureido)-5-hydroxypentanoyl)piperazine-1-carboxylate (3.4 g, quant.). LRMS (M+H+) m/z 501.2.

1. customto quench
2. customthe reaction
3. customThe solvents were removed
4. dissolutionThe residue was dissolved in EtOAc (100 mL)
5. filtrationThe salt was filtered off
6. concentrationthe filtrate was concentrated