10-Methyl-cis-9-decalinols are important motifs in several natural products and key intermediates in total synthesis. Herein, we wish to describe a highly chemo- and diastereoselective cyclization of ketoepoxides leading to 10-methyl-cis-9-decalinols. This method based on the use of zirconium(IV) tetrachloride permits the access to a wide variety of cis-decalinols in good to excellent yields. The cationic cyclization could also be performed with chiral keto-epoxide with complete control of the diastereoselectivity affording cis-bicyclic tertiary alcohol with good enantiomeric excess. The chemo- and the diastereoselectivity are assumed to result from the ability of Zr(IV) to generate highly stable bidentic complexes with alpha-hydroxy-ketone intermediates. (C) 2011 Elsevier Ltd. All rights reserved.
MELLOR M.; SANTOS A.; SCOVELL E. G.; SUTHERLAND J. K., J. CHEM. SOC. CHEM. COMMUN., 1978, NO 13, 528-529
作者:MELLOR M.、 SANTOS A.、 SCOVELL E. G.、 SUTHERLAND J. K.