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A one-pot and highly diastereoselective method for the reductive dehydroxylation of three classes of heterocyclic N,O-acetals with general structure 4 is reported. The method features a ‘two in one’ concept, namely, by synergetic action of two complementary Lewis acids (BF·OEt 2 and TiCl 4 ), the bicyclic or tricyclic oxazololactams 5 were formed in situ and reductively cleaved to...
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