Synthetic Studies towards Pectenotoxin-2: Synthesis of the Nonanomeric 10-epi-ABCDE Ring Segment by Kinetic Spiroketalization
作者:Jatta E. Aho、Antti Piisola、K. Syam Krishnan、Petri M. Pihko
DOI:10.1002/ejoc.201001411
日期:2011.3
The synthesis of the nonanomeric 10-epi-ABCDE ring system of pectenotoxin-2 has been achieved by using a kinetic spiroketalization reaction. The synthesis of the spiroketalization precursor was achieved through a cross-metathesis/hydro-genation sequence. The formation of the epi-C10 isomer resulted from an unexpected anti-Felkin selective addition of organometallic nucleophiles to the advanced CDE
pectenotoxin-2 的 nonanomeric 10-epi-ABCDE 环系统的合成已通过使用动力学 spiroketalization 反应实现。螺酮缩酮前体的合成是通过交叉复分解/加氢序列实现的。表观 C10 异构体的形成是由于有机金属亲核试剂出人意料地选择性加成到先进的 CDE 环前体上。这种加成反应是用不同保护的 α,β-双氧合模型醛研究的,它们显示出与有机金属亲核试剂相似的抗 Felkin 选择性。