6-Phenoxynicotinaldehyde → 2-phenoxy-5-((2-(pyridin-3-yl)-5,6-dihydropyridin-3(4H)-ylidene)methyl)pyridine dihydrochloride

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3-(5-Ammoniopentanoyl)pyridinium chloride (101 mg, 0.40 mmol) and 6-phenoxynicotinaldehyde (120 mg, 0.60 mmol) were combined in a reaction vessel and treated with isopropanol (15 mL). The reaction vessel was sealed and the reaction was heated to 80° C. with stirring overnight. The reaction was then cooled to room temperature. The precipitate that formed was recovered by vacuum filtration and washed with a 20% solution of isopropanol in hexane and then with ether. The recovered solid was then dried under vacuum giving 122 mg (73%) of a pale yellow solid. LC-MS: RT=5.08 min, [M+H]+=342.1.

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