Trifluoroacetic acid → (1,4-Diazepan-1-yl)(tetrahydro-2H-pyran-4-yl)methanone

Participants

Reaction Steps

To a solution of 13 g (41.7 mmol) of 4-(tetrahydro-pyran-4-carbonyl)-[1,4]diazepane-1-carboxylic acid tert-butyl ester in DCM (260 mL) were added 32.5 mL of trifluoroacetic acid. The reaction was stirred for 6 h at room temperature. The solvent was removed under reduced pressure. The residual oil was azeotroped with DCM (3×20 mL), chloroform (2×20 mL) and toluene (3×20 mL) to afford 22.9 g of [1,4]diazepan-1-yl-(tetrahydro-pyran-4-yl)-methanone as triple trifluoroacetic acid salt; ES−MS: m/z 213 [M+H+]

Provenance & Evidence