concise, enantioselective total synthesis of symbioramide, starting from simple achiral compounds and racemic α-amino-β-keto esterderivatives is reported. This highly flexible strategy allowed the efficient preparation of seven structural isomers of the natural product as well. The synthesis relies on a convergent route that involves the efficient stereoselective reduction of a α-keto-β-yne ester, and
A Sphingolipid Fatty Acid Constituent Made by Alkyne
<i>trans</i>
‐Hydrogenation: Total Synthesis of Symbioramide
作者:Karin Radkowski、Alois Fürstner
DOI:10.1002/adsc.202200540
日期:2022.10.4
acid ((−)-2) is reported, which is the fatty acid constituent of numerous sphingolipids of biological significance. Key to success was the chemoselective trans-hydrogenation of a functionalized propargylic alcohol precursor with [Cp*RuCl]4 as the catalyst, followed by lipase-catalyzed resolution of the racemic product. (−)-2 then served the shortest totalsynthesis of the marinenaturalproduct symbioramide
Stereoselective Synthesis of (−)-Chloramphenicol, (+)-Thiamphenicol and (+)-Sphinganine via Chiral Tricyclic Iminolactone
作者:Qiong Li、Hongbo Zhang、Chenguang Li、Pengfei Xu
DOI:10.1002/cjoc.201201093
日期:2013.1
The stereoselective syntheses of (−)‐chloramphenicol, (+)‐thiamphenicol and (+)‐sphinganine are described. The two continuous chiral centers within three target molecules were constructed through aldol reaction of chiraltricycliciminolactone and aldehyde.