Methanol → 2-Propyl-3-[[2'-(2H-tetrazol-5-yl)[1,1'-biphenyl]-4-yl]oxy]-4-quinolinecarboxylic acid

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Reaction Steps

A solution of the title E compound of Example 1, 3-[(2'-cyano[1,1'-biphenyl]-4-yl)oxy]-2-propyl-4-quinolinecarboxylic acid (3.9 g, 9.6 mmol) and tri-n-butyltin azide (9.6 g, 28.9 mmol) in o-xylene (3.9 mL) was heated to 108° C. for 48 hours. After cooling to room temperature, methanol (15 mL) was added and the dark brown solution was stirred for 20 minutes. The methanol was removed under vacuum, more methanol was added (15 mL), the reaction mixture was stirred briefly and concentrated again. The residue was dissolved in ethyl acetate (500 mL), washed three times with 1.0M trisodium citrate solution, brine, dried over sodium sulfate, and concentrated to yield a brown, viscous oil (10.98 g). Flash chromatography on silica gel (659 g), eluting with 70:25:5 toluene:acetone:acetic acid yielded the title compound as a light yellow solid 2.14 g).

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