Potassium Carbonate → (R)-1-tert-butylcarbonylmethyl-2-oxo-3-tert-butoxycarbonylamino-5-cyclohexyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine

Participants

Reaction Steps

To a solution of 50 g of (R)-(−)-2-oxo-3-tert-butoxycarbonylamino-5-cyclohexyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine in 200 ml of dimethylsulfoxide were added 28.1 g of 1-chloropinacolone, 28.8 g of potassium carbonate (powder), 1.15 g of potassium iodide and 1.35 g of tetrabutylammonium bromide. The mixture was stirred at room temperature for 4 hours. The reaction mixture was poured into ice water. The precipitate thus formed was collected by filtration with suction, washed with water and then dried, whereby 63.5 g of the title compound was obtained.

Provenance & Evidence