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In this paper, a comparative study of the reaction of 1-methylphthalazini- um ylides with non-symmetrically activated alkynes in a solid medium by classical heating and under microwaves is presented. The reactants were impregnated on a mineral support (Al2O3 - KF) or were brought into catalytic conditions through interphase solid - liquid transfer in the absence of a solvent and were then subjected to microwave irradiation. The reaction of 1-methylphthalazinium ylides with non- symmetrically activated alkynes on a mineral support and in phase transfer catalysis under microwave irradiation is a regioselective reaction and results in larger yields in a shorter time than under classical conditions.

The 1,3-dipolar cycloaddition of 1-methylphthalazinium ylides to non-symmetrically activated alkynes on a solid support under microwave irradiation