Synthesis of the Cytotrienin A CoreviaMetal Catalyzed C−C Coupling
摘要:
A synthetic approach to the C17-benzene ansamycins via metal catalyzed C-C coupling is described. Key bond formations include direct iridium catalyzed carbonyl crotylation from the alcohol oxidation level followed by chelation-controlled Sakurai-Seyferth dienylation to form the stereotriad, which Is attached to the arene via Suzuki cross-coupling. The diene-containing carboxylic acid is prepared using rhodium catalyzed acetylene-aldehyde reductive C-C coupling mediated by gaseous hydrogen. Finally, ring-closing metathesis delivers the cytotrienin core.
Total Synthesis of (+)-Trienomycins A and F via C–C Bond-Forming Hydrogenation and Transfer Hydrogenation
作者:David J. Del Valle、Michael J. Krische
DOI:10.1021/ja4061273
日期:2013.7.31
The triene-containing C17-benzene ansamycins trienomycins A and F were prepared in 16 steps (longest linear sequence, LLS) and 28 total steps. The C11-C13 stereotriad was generated via enantioselective Ru-catalyzed alcohol CH syn crotylation followed by chelation-controlled carbonyl dienylation. Enantioselective Rh-catalyzed acetylene-aldehyde reductive coupling mediated by gaseous H2 was used to form
含三烯的 C17-苯安沙霉素三烯霉素 A 和 F 以 16 个步骤(最长线性序列,LLS)和 28 个总步骤制备。C11-C13 立体三联体是通过对映选择性 Ru 催化的醇 CH 同步化生成,然后是螯合控制的羰基二烯化。由气态 H2 介导的对映选择性 Rh 催化乙炔-醛还原偶联用于形成二烯,该二烯最终经过二烯-二烯闭环复分解反应形成大环。本方法比以前合成的三烯霉素 A 和 F 短 14 步 (LLS),比任何以前合成的含三烯的 C17-苯安沙霉素短 8 步。
Synthesis of the Cytotrienin A Core<i>via</i>Metal Catalyzed C−C Coupling
作者:Michael Rössle、David J. Del Valle、Michael J. Krische
DOI:10.1021/ol200160p
日期:2011.3.18
A synthetic approach to the C17-benzene ansamycins via metal catalyzed C-C coupling is described. Key bond formations include direct iridium catalyzed carbonyl crotylation from the alcohol oxidation level followed by chelation-controlled Sakurai-Seyferth dienylation to form the stereotriad, which Is attached to the arene via Suzuki cross-coupling. The diene-containing carboxylic acid is prepared using rhodium catalyzed acetylene-aldehyde reductive C-C coupling mediated by gaseous hydrogen. Finally, ring-closing metathesis delivers the cytotrienin core.