Tributylphosphine → 4-[2-(4-Amino-furazan-3-yl)-1-ethyl-1H-imidazo[4,5-c]pyridin-7-yloxy]-piperidine-1-carboxylic Acid Tert-Butyl Ester

Participants

Reaction Steps

A mixture of the product from Example 283 (0.1 g, 0.406 mmol), 4-hydroxy-piperidine-1-carboxylic acid tert-butyl ester (0.074 g, 0.369 mmol) and tributylphosphine (0.074 g, 0.369 mmol) in tetrahydrofuran (5 ml) was treated with 1,1′-(Azodicarbonyl)-dipiperidine (0.093 g, 0.369 mmol) and heated at reflux for 18 hours. The reaction was then cooled to RT and then applied to a SCX ion exchange column and eluted with methanol and then a mixture of methanol/0.880 ammonia (9:1). The basic fractions were then reduced and the solid residue chromatographed on silica gel eluting with ethyl acetate to afford the title compound, (0.03 g, 17%); MS (ES+) m/e 430 [M+H]+.

Provenance & Evidence