1,8-Diazabicyclo(5.4.0)undec-7-ene → 10-ethyl-8,9-dihydro-7-[(5-methyl-1-trityl-1H-imidazol-4-yl)methylene]pyrido[1,2-a]indol-6(7H)-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 7-[(acetoxy)(5-methyl-1-trityl-1H-imidazol-4-yl)methyl]-10-ethyl-8,9-dihydropyrido[1,2-a]indol-6(7H)-one (2.06 g) in toluene (30 ml) at room temperature was added 1,8-diazabicyclo[5.4.0]undec-7-ene (1.2 ml). After being stirred at 75° C. for 3 hours, the solution was diluted with chilled water. The organic layer separated was washed with aqueous oxalic acid solution, water, and brine, dried over anhydrous sodium sulfate, and evaporated in vacuo. The residue was triturated with methanol and filtered to give 10-ethyl-8,9-dihydro-7-[(5-methyl-1-trityl-1H-imidazol-4-yl)methylene]pyrido[1,2-a]indol-6(7H)-one (1.41 g).

Provenance & Evidence