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
An efficient synthesis of ophiocerins A and C has been achieved via a common intermediate. The stereogenic centers were generated by means of Jacobsen’s hydrolytic kinetic resolution and Sharpless kinetic resolution.
A novel stereoselective total synthesis of ophiocerin C was accomplished starting from l-(+)-tartaric acid. The C3,C4 vic-diol moiety was obtained from tartaric acid, and the stereogenic centre at C6 was created by substrate-controlled epoxidation and subsequent regioselective cleavage of the epoxide ring. Wittig reactions - tartaric acid - epoxidations - ring opening - ophiocerin C - stereoselective