Highly enantioselective catalytic Michael reaction of α-substituted malonates using La-linked-BINOL complex in the presence of HFIP (1,1,1,3,3,3-hexafluoroisopropanol)
作者:Ryo Takita、Takashi Ohshima、Masakatsu Shibasaki
DOI:10.1016/s0040-4039(02)00882-1
日期:2002.5
conditions, the catalyticasymmetricMichaelreaction of a variety of α-substituted malonates proceeded successfully in high yield (up to 93%) and excellent enantiomeric excess (up to 99% ee). The addition of HFIP was also effective for the reaction of nonsubstituted malonates. In this case, 5 mol% of the La-linked-BINOLcomplex was sufficient for completion of the reaction in approximately 24 h. Moreover
Enantioselective Total Synthesis of (+)‐Plumisclerin A
作者:Ming Gao、Ye‐Cheng Wang、Kai‐Rui Yang、Wei He、Xiao‐Liang Yang、Zhu‐Jun Yao
DOI:10.1002/anie.201808517
日期:2018.10
The first and enantioselectivetotalsynthesis of (+)‐plumisclerin A, a novel unique complex cytotoxic marine diterpenoid, has been accomplished. Around the central cyclopentane anchorage, a sequential ring‐formation protocol was adopted to generate the characteristic tricycle[4.3.1.01,5]decane and trans‐fused dihyrdopyran moiety. Scalable enantioselective LaIII‐catalyzed Michael reaction, palladium(0)‐catalyzed
已完成(+)-plumisclerin A的首次和对映选择性全合成,这是一种新颖的独特的复杂细胞毒性海洋二萜类化合物。在中央环戊烷锚定周围,采用顺序成环规程以生成特征性的三环[4.3.1.0 1,5 ]癸烷和反式稠合的双氢吡喃部分。可扩展的对映选择性La III催化的Michael反应,钯(0)催化的羰基化反应和SmI 2介导的自由基共轭加成已成功地应用于合成中,从而提供了多克复杂且刚性的B / C / D-环系统,具有六个连续的立体成因中心和两个全碳四元中心。该反式与-融合dihyrdopyran部分exo侧链的最后阶段是通过内酯前体的顺序氧化还原转化而完成的,克服了密集多环系统的较大空间位阻。报道的总合成也证实了天然(+)-半荧光素A的绝对化学性质。