Abstract
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•Highly versatile and regioselective method for the synthesis of internal alkenes.•Unique method for dehydrative cross-coupling/homo-dimerization/direct cross couplings.•Successfully extended to the synthesis of novel benzopyrans.•Solvent-free; step, atom economy and environmentally benign catalyst.•Large substrate scope, high yields; user-friendly protocol.
A simple and operationally easy protocol for the regioselective synthesis of internal alkenes through a dehydrative cross-coupling and direct coupling procedure has been described using the environmentally benign Ca(II) catalyst. Several alkenes and alcohols underwent the coupling reaction under solvent-free conditions in a short time to produce the desired alkenes. This method is further extended to show the application in the synthesis of novel benzopyran molecules through a cascade strategy.