Triphenylphosphine → HCID 68062013, compound

Participants

Reaction Steps

A round bottom flask was charged with triphenylphosphine (2.64 g, 10.0 mmol), diisopropylazodicarboxylate (1.99 mL, 10.0 mmol) and THF (23 mL) at 0° C. After the yield crashed out of solution (less than 10 minutes), tert-butyl (5-(4-(trifluoromethyl)phenyl)pyrazin-2-yl)carbamate (3.10 g, 9.10 mmol) and (±)-ethyl 4-(1-hydroxybutyl)benzoate (2.03 g, 9.14 mmol) followed by THF (10 mL). Reaction stirred at room temperature overnight. Reaction diluted with DCM and ammonium chloride solution (aq. sat.) and transferred to an extraction funnel. Aqueous extracted twice with DCM. Combined organic layers washed with brine (1×), dried over sodium sulfate, filtered and concentrated to provide the crude material. Purification by silica gel flash chromatography (MeOH/DCM) provide the title compound as a yellow gum (4.86 g, 98.0%). 1H NMR (400 MHz, CHLOROFORM-d) δ 0.96 (t, 3H) 1.36 (s, 9H) 1.37-1.54 (m, 5H) 2.06-2.18 (m, 1H) 2.23-2.35 (m, 1H) 4.38 (q, J=7.24 Hz, 2H) 5.77 (dd, J=9.10, 6.55 Hz, 1H) 7.51 (d, J=8.61 Hz, 2H) 7.76 (d, J=8.61 Hz, 2H) 7.95-8.02 (m, 2H) 8.12 (d, J=8.22 Hz, 2H) 8.74 (d, J=1.37 Hz, 1H) 8.83 (d, J=1.56 Hz, 1H); MS (M+1): 544.5.

Provenance & Evidence