An efficient one-pot four-step domino reaction for the synthesis of C2-substituted 3-methylcyclohex-2-enones
摘要:
An efficient one-pot four-step domino reaction of substituted beta-ketoesters has been optimized giving rise to a large panel of C2-substituted 3-methylcyclohex-2-enones, an important scaffold for the preparation of various initiators for cationic or radical cyclizations. The developed methodology is quite general and applicable to a wide range of beta-ketoester substrates, allowing the introduction of various functionalities at the C2 position of the 3-methylcyclohex-2-enones, in good to excellent yields. (C) 2010 Elsevier Ltd. All rights reserved.
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.
AMUPITAN, J. A.;HUQ, E.;MELLOR, M.;SCOVELL, E. G.;SUTHERLAND, J. K., J. CHEM. SOC. PERKIN TRANS., 1983, N 4, 747-749
作者:AMUPITAN, J. A.、HUQ, E.、MELLOR, M.、SCOVELL, E. G.、SUTHERLAND, J. K.