RETRACTED: Novel synthetic approach to 1α,25-dihydroxyvitamin D3 and analogues

This article has been retracted at the request of the Editor-in-Chief and Author. Please see http://www.elsevier.com/locate/withdrawalpolicy . Reason: a virtually identical paper was previously published in Organic Letters [Pd-Catalyzed Carbocyclization-Negishi Cross-Coupling Cascade: A Novel Approach to 1α,25-Dihydroxyvitamin D3 and Analogues. Org. Lett. , 7 (2005) 5885–5887].