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Ti-catalyzed reactions of unsymmetrical alkynes with esters of monocarboxylic acids and EtAlCl2: An efficient catalytic method for the synthesis of tetrasubstituted furans
A new one-pot synthesis of tetrasubstituted furans by the reaction between unsymmetrical alkynes and esters of carboxylic acids in the presence of EtAlCl2 and Cp2TiCl2 catalyst has been developed. The effect of the unsymmetrical alkyne substituent on the chemoselectivity of the reaction was studied.