P-stereogenic secondary iminophosphorane ligands and their rhodium(I) complexes: taking advantage of NH/PH tautomerism |
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Authors: | León Thierry Parera Magda Roglans Anna Riera Antoni Verdaguer Xavier |
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Affiliation: | Unitat de Recerca en Síntesi Asimètrica-PCB, Institute for Research in Biomedicine, Universitat de Barcelona, Spain. |
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Abstract: | Have a good SIP: P-stereogenic secondary iminophosphorane (SIP) ligands with a sulfonyl group attached to nitrogen have been prepared. In the presence of rhodium, the tautomeric equilibrium is shifted from the favored PH tautomer towards the P(III) tautomer, thereby allowing coordination of the SIP ligand through the P and O atoms. The resulting Rh complexes are effective in the [2+2+2] cycloaddition of enediynes with terminal alkynes. |
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Keywords: | asymmetric catalysis cycloaddition reactions ligand design phosphorus rhodium |
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