Trifluoroacetic acid → HCID 68533409, compound

Participants

Reaction Steps

(5-Oxo-bicyclo[2.2.2]oct-2-yl)-carbamic acid tert-butyl ester (Preparation 75, 279 g, 1.17 mol, 10 eq) was taken up in DCM (450 mL). TFA (416 mL, 5.60 mol, 4.8 eq) was added dropwise. On addition, the reaction warms to reflux while much gas evolves. The reaction mixture was kept at reflux temperature for 1 hour after which it was allowed to cool to room temperature overnight. The mixture was concentrated and the residue was taken up in DCM (50 mL) and then tert-butyl methyl ether (1.3 L) was added which resulted in a brown suspension. The solids were collected by filtration (P3) and were washed with tert-butyl methyl ether. The latter was dried in vacuo (40° C.) to furnish title compound as an off-white solid (272 g, 1.07 mol, 92%).

Provenance & Evidence