Abstract
Iodine catalyzes the pseudo four-component reaction of an aldehyde, a urea or thiourea, and cyclic 1,3-dicarbonyl compounds under microwave irradiation in a solvent-free condition to yield various σ symmetric spiro heterobicyclic rings in excellent yields.
Graphical Abstract
References
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Prajapati, D., Bhuyan, D., Gohain, M. et al. Green chemistry approaches to the regioselective synthesis of spiro heterobicyclic rings using iodine as a new and efficient catalyst under solvent-free conditions. Mol Divers 15, 257–261 (2011). https://doi.org/10.1007/s11030-010-9247-4
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DOI: https://doi.org/10.1007/s11030-010-9247-4