Synthesis of Ophiocerins A, B and C, Botryolide E, Decarestrictine O, Stagonolide C and 9-<i>epi</i>-Stagonolide C Employing Chiral Hexane-1,2,3,5-tetraol Derivatives as Building Blocks
作者:Krishanu Show、Pradeep Kumar
DOI:10.1002/ejoc.201600625
日期:2016.9
organocatalytic approach to the synthesis of (2R,3S)-hexane-1,2,3,5-tetraol (11) derivatives (in the forms of different stereoisomers and bearing different protecting groups) has been developed. The key chiral intermediates 11 were prepared with complete stereocontrol through the proline-catalyzed intermolecular aldol reaction between acetone and d-glyceraldehyde acetonide. The synthetic utility of the
concise synthesis of a chiral hexane-tetraol intermediate is achieved from d-glucono-δ-lactone in 6 steps featuring the successively selective deoxygenation. The versatile intermediate can be easily converted into the γ-lactone compound botryolide E and tetrahydropyran derivative ophiocerins A-C respectively. In addition, the direct transformation of ophiocerin C to ophiocerins A and B by Mitsunobu reaction
Stereoselective Total Synthesis of Botryolide E and Ophiocerin C
作者:Jhillu S. Yadav、N. Mallikarjuna Reddy、Md. Ataur Rahman、A. Mallikarjuna Reddy、Attaluri R. Prasad
DOI:10.1002/hlca.201300203
日期:2014.4
A highly stereoselective approach to the totalsynthesis of the γ‐lactone derivative botryolide E and tetrahydropyran derivative ophiocerin C via a common polyketide precursor by means of Prinscyclization and MacMillan α‐aminoxylation sequence is described. The method can conveniently be utilized for the preparation of further related γ‐lactone and tetrahydropyran derivatives.
A simple highly concise protective group-free synthesis of botryolide-E from (R)-propylene oxide was developed using Hoveyda Grubbs cross metathesis, Still's modified Horner-Wadsworth-Emmons reaction, and Sharpless asymmetric dihydroxylation, as key steps. (C) 2012 Elsevier Ltd. All rights reserved.
An efficient chiral-pool synthesis of botryolide-E