Bismuth Triflate−Chiral Bipyridine Complexes as Water-Compatible Chiral Lewis Acids
Organic Letters2005Vol. 7(21), pp. 4729–4731
Citations Over TimeTop 10% of 2005 papers
Abstract
[reaction: see text] Catalytic asymmetric hydroxymethylation of silicon enolates with an aqueous formaldehyde solution has been developed using a chiral bismuth complex. This is the first example of highly enantioselective reactions using a chiral bismuth catalyst in aqueous media. In this paper, we have added Bi(OTf)(3)-1 complex as a "water-compatible Lewis acid". Bi(OTf)3 is unstable in the presence of water but is stabilized by the basic ligand.
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