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.
Synthesis of Ophiocerins from Non-Carbohydrate Sources
作者:Hui-Jeong Hong、Dong-Min Lee、Han-Young Kang
DOI:10.5012/bkcs.2010.31.03.555
日期:2010.3.20
stereochemistry after synthesizing the tetrahydropyran ring.The general synthetic strategy presented herein is shown in the following retrosynthetic analysis (Scheme 1). The ophio-cerins could be derived from dihydropyran derivative
First Stereoselective Total Synthesis of Ophiocerins B and C
作者:J. Yadav、P. Lakshmi、S. Harshavardhan、B. Reddy
DOI:10.1055/s-2007-982579
日期:2007.7
An elegant synthesis of ophiocerinsB and C is accomplished for the first time with 3 R,4 R,6 R and 3 S,4 S,6 R-configuration. Of these three stereogenic centers, the C-3/C-4 VIC-diol was created by Sharpless asymmetric dihydroxylation, while the C-6 stereocenter was achieved from known chiral epoxide. The synthesis of ophiocerinsB and C defined the absolute stereochemistry of these natural products
首次以 3 R,4 R,6 R 和 3 S,4 S,6 R 构型完成了 ophiocerins B 和 C 的优雅合成。在这三个立体中心中,C-3/C-4 VIC-二醇是通过 Sharpless 不对称二羟基化产生的,而 C-6 立体中心是由已知的手性环氧化物制成的。ophiocerins B 和 C 的合成定义了这些天然产物的绝对立体化学。
Substrate-Controlled Stereoselective Synthesis of Ophiocerin C
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