3,4-dihydro-2H-pyran → HCID 12832387, compound

Participants

Reaction Steps

14.17 g of 4,5-bis(4-methoxyphenyl)imidazole is suspended in 250 ml of absolute 1,2-dichloroethane and combined with 16 g of 3,4-dihydro-2H-pyran as well as 0.5 ml of tin tetrachloride. The mixture is heated to reflux under agitation for 12 hours, then allowed to cool, and poured into 500 ml of cold sodium bicarbonate solution. The organic phase is separated, dried over sodium sulfate, and concentrated under vacuum. The residue is dissolved in dichloromethane and subjected to hexane precipitation. The sediment is dissolved in ether. The solution is clarified with activated carbon, concentrated under vacuum, and made to crystallize, thus producing 15.03 g of 4,5-bis(4-methoxyphenyl)-1-(tetrahydropyran-2-yl)imidazole, mp 127°-128°.

Provenance & Evidence