1,8-Diazabicyclo(5.4.0)undec-7-ene → HCID 59432483, compound

Participants

Reaction Steps

Heat a mixture of (R)-7-ethyl-5-hydroxy-8-trifluoromethyl-2,3,4,5-tetrahydro-benzo[b]azepine-1-carboxylic acid tert-butyl ester (7.59 g, 21.12 mmol), diphenylphosphoryl azide (DPPA, 5.50 mL, 25.64 mmol) and DBU (3.95 mL, 26.41 mmol) in toluene (200 mL) at 65° C. under nitrogen for 12 h. Add silica gel to the cooled mixture and remove the solvents under reduced pressure. Purify the residue by column chromatography, eluting with ethyl acetate/hexanes (1:2), to provide the title compound as a colorless oil (5.79 g, 71%): 1H NMR (CDCl3, 300 MHz) δ 1.21-2.30 (m, 18H), 2.83-2.89 (m, 2H), 4.78-4.80 (m, 1H), 7.31-7.45 (m, 2H); APCI MS m/z 356 (M−N2)−.

Provenance & Evidence