Enantioselective Synthesis of Biphenols from 1,4-Diketones by Traceless Central-to-Axial Chirality Exchange
作者:Fenghai Guo、Leah C. Konkol、Regan J. Thomson
DOI:10.1021/ja108717r
日期:2011.1.12
A method for the enantioselective synthesis of biphenols from readily prepared 1,4-diketones is reported. Key to the success of this method is the highly selective transfer of central to axial chirality during a double aromatization event triggered by BF3 center dot OEt2. On the basis of X-ray crystallographic data, a stereochemical model for this chirality exchange process is put forth.
Enantioselective Total Synthesis and Studies into the Configurational Stability of Bismurrayaquinone A
作者:Leah C. Konkol、Fenghai Guo、Amy A. Sarjeant、Regan J. Thomson
DOI:10.1002/anie.201104726
日期:2011.10.10
concise strategy of the first enantioselective total synthesis of bismurrayaquinone A utilized traceless stereochemical exchange to form an enantioenriched biphenyl core that was elaborated in a bidirectional manner to the natural product. Observed racemization on an unsuccessful initial route prompted studies into the configurationalstability of bismurrayaquinone A and related biquinones.
旋转丢失:双Murrayaquinone A 的第一个对映选择性全合成的简明策略利用无痕立体化学交换形成对映体富集的联苯核心,并以双向方式与天然产物进行精制。在一条不成功的初始路线上观察到的外消旋作用促使人们对双醌 A 和相关联醌的构型稳定性进行了研究。