A solution of 0.10 g (4.18 mmol) LiOH in 6 mL water was added to a solution of 0.98 g (1.83 mmol) (R)-1-methoxycarbonyl-2-(2-methoxy-7-methyl-1H-benzimidazol-5-yl)-ethyl 4-(2-oxo-1,2,4,5-tetrahydro-1,3-benzodiazepin-3-yl)-piperidine-1-carboxylate in 18 mL THF and the reaction solution was stirred overnight at RT. 1.05 mL of 4 M HCl was added and the THF was eliminated i.vac. The mixture was decanted to separate off the oily residue, this was dissolved in DCM/MeOH and the organic phase was dried on Na2SO4. After the desiccant and solvent had been eliminated the desired product was obtained.
