Catalytic enantioselective tandem carbonyl ylide formation–cycloadditions of α-diazo-β-keto ester 1 using 0.5 mol% dirhodium tetrakis(1,1′-binaphthyl-2,2′-diyl phosphate) catalysts 7–9 and 14 to give the cycloadduct 3 in good yields and up to 90% ee are described.
D. M. Hodgson, P. A. Stupple and C. Johnstone, Chem. Commun., 1999, 2185 DOI: 10.1039/A906787F
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