Research Article

Synthesis of Polyfunctionalized 4H-Pyrans

Table 1

Screening of solvents.^a

Entry Solvent Isolated Yield (%) 1 No solvent 0 2 Dichloromethane 15 3 Chloroform 12 4 Acetonitrile 33 5 DMF 40 6 Ethanol 85 7 Water 0

aReaction conditions: stoichiometric ratio of all the reactants with base (30 mg/mmol) in ethanol at RT for 5 h.