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Experimental procedures, analytical data and NMR spectra.
This material is available free of charge via the Internet at
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The authors declare no competing financial interests.
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This work was financially supported by Aarhus University,
Carlsberg Foundation and FNU. L.C. thanks the Alma Mater
Studiorum – University of Bologna for the fellowship. Mag-
nus E. Jensen and Dr. Jacob Overgaard are gratefully
acknowledged for performing X-ray analysis.
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(17) A catalyst bearing a very bulky triphenylsiloxy substituent
at C4 has also been synthesized and employed under opti-
mized reaction conditions (cf. Table 1, entry 11). In this case
product 3b was obtained in only low yield and mediocre dr.
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(19) The absolute configuration of compounds 3 was assigned by
analogy. See Supporting Information for details.
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