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J Org Chem. 2013 Sep 6;78(17):8712-21. doi: 10.1021/jo4014194. Epub 2013 Aug 23.

Chiral bis(imidazolinyl)phenyl NCN pincer rhodium(III) catalysts for enantioselective allylation of aldehydes and carbonyl-ene reaction of trifluoropyruvates.

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Henan Key Laboratory of Chemical Biology and Organic Chemistry, The College of Chemistry and Molecular Engineering, Zhengzhou University , Zhengzhou 450052, People's Republic of China.


Chiral NCN pincer rhodium(III) complexes with bis(imidazolinyl)phenyl ligands were found to be effective catalysts for the allylation of a variety of electronically and structurally diverse aldehydes with allyltributyltin, giving the corresponding optically active homoallylic alcohols in high yields with enantioselectivities of up to 97% ee. These complexes were also applied in the carbonyl-ene reaction of ethyl or methyl trifluoropyruvate with various 2-arylpropenes. With the aid of silver trifluoromethanesulfonate, the pincer rhodium(III) catalysts could catalyze the reaction to provide the corresponding chiral α-hydroxy-α-trifluoromethyl esters in good yields with high stereoselectivities (up to 95% ee).

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