Sequential Reactions of Alkynes on an Iridium(III) Single Site
Elena A Giner1,2, Mar Gómez-Gallego1,2, Alba D Merinero1,2
1Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense, 28040, Madrid, Spain.
Abstract:
Sequential insertion of terminal alkynes on IrIII cyclometalated complexes allow the formation of novel metallapolycycles in a controlled and efficient manner. ortho-Methylarylethynyl derivatives led to an unprecedented cascade combination of three fundamental processes (C-C bond formation, C(sp3 )-H activation, and reductive coupling) on a single IrIII center, in a process compatible with functionalized biomolecules and photoactive substrates. The reaction with tert-butylacetylene led to a [6,5,4]-polycycle that incorporates an iridacyclobutenylidene in its structure. The sequence is a multicomponent reaction in which the metal not only promotes the different steps but also determines their stereoselectivity. This is an elegant example of the synergy between a metal-promoting reaction and a symmetry-defined stereochemistry.
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