Formic Acid → (R)-1-(4-formyloxy-3,5-dimethyl-benzyl)-2-(4-morpholin-4-yl-piperidin-1-yl)-2-oxo-ethyl 4-(2-oxo-1,2,4,5-tetrahydro-1,3-benzodiazepin-3-yl)-piperidine-1-carboxylate

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Reaction Steps

A solution of 100 μL acetic anhydride and 1 mL formic acid in 3 mL DCM was stirred for 2 h at RT (formation of the mixed anhydride). Then 100 mg (0.16 mmol) (R)-1-(4-hydroxy-3,5-dimethyl-benzyl)-2-(4-morpholin-4-yl-piperidin-1-yl)-2-oxo-ethyl 4-(2-oxo-1,2,4,5-tetrahydro-1,3-benzodiazepin-3-yl)-piperidine-1-carboxylate (Example 1.20a) were added and the reaction mixture was stirred for 2 h at RT. The reaction solution was evaporated down and the residue was again added to a solution of the mixed anhydride and stirred overnight at RT. The mixture was evaporated down i.vac. and the residue was purified by HPLC. The fractions containing the product were combined and lyophilised.

Provenance & Evidence