tert-Butyl piperazine-1-carboxylate → HCID 67026375, compound

Participants

Reaction Conditions

Reaction Steps

A solution of the product of Example 63 (200 mg, 0.66 mmol) and tert-butyl piperazine-1-carboxylate (Aldrich, 123 mg, 0.66 mmol) in toluene (anhydrous, 10 mL) was degassed and purged with nitrogen three times, sodium t-butoxide (Aldrich, 64 mg, 0.66 mmol) and tris(dibenzylideneacetone)dipalladium(0) (Aldrich, 12.1 mg, 0.013 mmol), 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (Aldrich, 23.0 mg, 0.040 mmol, xantphos) were added, degassed and purged with nitrogen three times. The mixture was then heated to 100° C. and stirred under nitrogen for 15 hours. It was then cooled to ambient temperature and diluted with ethyl acetate (50 mL), washed with brine (2×5 mL), concentrated, purified with chromatography (v. ethyl acetate/hexane=1/1, Rf=0.6) to give the title compound. 1H NMR (300 MHz, CD3OD) δ 1.49 (s, 9 H), 3.25-3.30 (m, 4 H), 3.56-3.71 (m, 4 H), 7.31 (ddd, J=8.4, 2.6, 0.8 Hz, 1 H), 7.49 (t, J=8.0 Hz, 1 H), 7.64 (ddd, J=8.0, 4.9, 0.7 Hz, 1 H), 7.70 (dt, J=8.0, 1.1 Hz, 1 H), 7.79 (dd, J=2.4, 1.7 Hz, 1 H), 8.56 (dt, J=7.9, 2.0 Hz, 1 H), 8.74 (dd, J=4.9, 1.5 Hz, 1 H), 9.29 (dd, J=2.2, 0.8 Hz, 1 H) ppm; MS (DCI/NH3) m/z 408 (M+H)+.

Provenance & Evidence