2-Chloro-1,1,1-triethoxyethane → 4'-[5-(chloromethyl)-1,3,4-oxadiazol-2-yl]-N-cyclopropyl-5-fluoro-6-methyl-1,1'-biphenyl-3-carboxamide

Participants

Reaction Steps

N-Cyclopropyl-5-fluoro-4′-(hydrazinocarbonyl)-6-methyl-1,1′-biphenyl-3-carboxamide (Intermediate 29) (580 mg) in 2-chloro-1,1,1-triethoxyethane (2.5 ml) was heated at 80° C. for 20 hours. The reaction was absorbed onto silica and purified by chromatography on a biotage column (silica, 40 g), eluting with cyclohexane and then with ethyl acetate/cyclohexane (2:3). The product fractions were reduced to dryness under vacuum to give 4′-[5-(chloromethyl)-1,3,4-oxadiazol-2-yl]-N-cyclopropyl-5-fluoro-6-methyl-1,1′-biphenyl-3-carboxamide.

Provenance & Evidence