Chinese Chemical Letters, ( ISI ), Volume (23), No (10), Year (2012-10) , Pages (1153-1156)
Title : ( Efficient synthesis of novel 9H-xanthen-9-yl derivatives of bidentate heterocyclic nucleophiles by Fe(HSO4)3 as a catalyst )
Authors: Hossein Eshghi , Mehdi Bakavoli , javad abedini torghabeh , Mohammad Rahimizadeh ,
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Abstract
We have demonstrated the direct substitution of 9H-xanthen-9-ol with different nucleophilic reagents such as thiazoles, triazoles, tetrazoles, hydrazines and hydrazinecarboxamides in good to high yields. This reaction catalyzed by ferric hydrogensulfate as a heterogeneous acid catalyst in ethanol through SN1 type reaction of pyrylium with a nucleophilic reagent afforded the heterocycle- and aromatic-N-substituted xanthene derivatives as simple marked molecules in short reaction times.
