Triphenylphosphine → Methyl [3-[2-(1,6-dihydro-6-oxo-3,4-diphenyl-1-pyridazinyl)ethyl]phenoxyacetate]

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Diethyl azodicarboxylate (2.73 g, 2.50 mL, 16 mmol) was added to a stirred solution of 5,6-diphenyl-3(2H)-pyridazinone (3.00 g, 12 mmol), methyl [3-(2-hydroxyethyl)-phenoxy]acetate (2.80 g, 13 mmol) and triphenylphosphine (4.12 g, 16 mmol) in dry THF (75 mL) maintained at 0° C. The ice bath was removed and the mixture stirred at room temperature for 1.75 hours before removal of the solvent. The residue was chromatographed twice on columns of silica gel using mixtures of diethyl ether and hexanes (7:3) and then (3:2) as eluent to give methyl [3-[2-(1,6-dihydro-6-oxo-3,4-diphenyl-1-pyridazinyl)ethyl]phenoxyacetate] (5.12 g, 98%), contaminated with 0.6 equivalents of 1,2-dicarbethoxy hydrazine, as a white foam.

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