Triphenylphosphine → Methyl 12-cyclohexyl-3-hydroxy-6,7-dihydro-5-oxa-7a-azadibenzo[a,e]azulene-9-carboxylate

Participants

Reaction Steps

To a solution of methyl 3-cyclohexyl-2-(2,4-dihydroxyphenyl)-1-(2-hydroxyethyl)-1H-indole-6-carboxylate (10.3 g, 28.2 mmol) in tetrahydrofuran (500 ml) were added triphenylphosphine (7.3 g, 27.7 mmol) and diethyl azodicarboxylate (4.4 ml, 27.7 mmol) under ice-cooling, and the mixture was stirred for 4 hr. The reaction mixture was concentrated and the obtained residue was purified by silica gel chromatography (hexane:ethyl acetate=3:2) to give methyl 12-cyclohexyl-3-hydroxy-6,7-dihydro-5-oxa-7a-azadibenzo[a,e]azulene-9-carboxylate (6.5 g, yield 66%).

Provenance & Evidence