Acetic Anhydride → 4,6-Bis(1,1-dimethylethyl)-2-[[2-(3-pyridinyl)]ethenyl]-5-pyrimidinol

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 4,6-bis(1,1-dimethylethyl)-5-[(2-methoxyethoxy)methoxy]-α-(3-pyridinyl)-2-pyrimidine-ethanol (350 mg), sodium acetate (10 g) and acetic anhydride (7 mi) in toluene (100 ml) is heated at reflux for 8 hours. The reaction mixture is cooled and the solvent is evaporated. Dichlorobenzene (30 ml) is added and the reaction mixture is heated at 190° C. for 30 minutes. The reaction mixture is cooled and partitioned between ethyl acetate and water. The aqueous layer is adjusted to pH 4 with 1 N HCl. The organic layer is collected and evaporated. Purification of the residue by flash chromatography (silica, 1:1 ethyl acetate/hexane) followed by recrystallization from hexane gives pure 4,6-bis(1,1-dimethylethyl)-2-[[2-(3-pyridinyl)]ethenyl]-5-pyrimidinol (130 mg, 40%); mp 150°-151° C.

Herkunft & Nachweise