Journal of Chemistry / 2013 / Article / Tab 3

Research Article

Synthesis of Polyfunctionalized 4H-Pyrans

Table 3

Synthesis of substituted pyrans from acetylacetone via Scheme 1.a,b

EntryRProductTime (h)% Yieldcm.p. (°C)

13-NO2C6H41a385161- 162 [17]
24-NO2C6H41b3.0 82168-169
4Ph1d572293– 195 [17]
64-MeOC6H41f678210– 213 [17]
74-CH3C6H41g681274– 276 [17]

aAll reactions were carried out at room temperature; bequimolar ratio of all the reactants with 30 mg Amberlyst A21/mmol of aldehyde; cisolated yields.

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