L. D’Accolti et al. / Tetrahedron Letters 43 (2002) 4649–4652
4651
Scheme 4.
Scheme 5.
oxygen substituents,7 but not so large. The difference in
the stereoselectivity of attack on 2 and 3 is unexplained
so far. We are continuing to explore the cause of the
high selectivities observed in these reactions.
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