Triphenylphosphine → 7-(furan-3-ylmethoxy)-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinoline

Participants

Reaction Steps

2-Methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-7-ol (300 mg, 1.17 mmol), triphenylphosphine (921 mg, 3.51 mmol), and 3-furanmethanol (173 mg, 1.76 mmol) were slurried in 20 mL of anhydrous THF. After 5 minutes diisopropyl azodicarboxylate (710 mg, 3.51 mmol) was added dropwise to the mixture. The resulting homogeneous solution was stirred six days. Analysis of the reaction by HPLC indicated that mostly starting material was present. Additional portions of triphenylphosphine (150 mg), 3-furanmethanol (0.5 mL) were added followed by diisopropyl azodicarboxylate (1 mL). Analysis of the reaction after 1 hour indicated that all of the 2-methyl-1-(2-methylpropyl)-1H-imidazo-[4,5-c]quinolin-7-ol was consumed. The reaction was filtered through an acidic ion-exchange resin with methanol followed by 1M ammonia in methanol. The filtrate was concentrated to give 500 mg of 7-(furan-3-ylmethoxy)-2-methyl-1-(2-methylpropyl)-1H-imidazo[4,5-c]quinoline as a dark orange oil.

Provenance & Evidence