Triphenylphosphine → tert-Butyl 2-{4-[5-(2-fluorophenoxy)oxazolo[5,4-b]pyridin-2-yl]-2,6-dimethylphenoxy}-2-methylpropionate

Participants

Reaction Steps

With ice cooling, 72 mg of triphenylphosphine were dissolved in 1 ml of dry tetrahydrofuran, and 47 mg of diethyl azodicarboxylate were added. After 15 min, 80 mg of 4-[5-(2-fluorophenoxy)oxazolo[5,4-b]pyridin-2-yl]-2,6-dimethylphenol were added, followed by 32 μl of triethylamine and 44 mg of tert-butyl alpha-hydroxyisobutyrate. The reaction mixture was then stirred at room temperature for 16 hours, and another 72 mg of triphenylphosphine and 47 mg of diethyl azodicarboxylate were added with ice cooling. After a further 4 h at room temperature, the reaction was concentrated and purified by preparative HPLC. This gave 60 mg (53%) of the title compound.

Provenance & Evidence