Pyridine → trans-6-pentafluoroethyl-2,2-bisfluoromethyl-3,4-dihydro-4-(2-pyridyloxy)-2H-1-benzopyran-3-ol

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Reaction Steps

A mixture of 0.42 g of 3,4-epoxy-6-pentafluoroethyl-2,2-bisfluoromethyl-3,4-dihydro-2H-1-benzopyran, 0.21 g of 2-hydroxypyridine, 0.11 g of pyridine and 4 ml of ethanol was refluxed for 3 hours and the solvent was distilled off. The resultant residue was purified using silica gel column chromatography (developing solution, MeOH:CH2Cl2 =1:99) to obtain from the first eluted fraction 0.11 g of oily trans-6-pentafluoroethyl-2,2-bisfluoromethyl-3,4-dihydro-4-(2-pyridyloxy)-2H-1-benzopyran-3-ol represented by the following formula.

Provenance & Evidence