An expedient route to substituted furans via olefin cross-metathesis
作者:Timothy J. Donohoe、John F. Bower
DOI:10.1073/pnas.0913466107
日期:2010.2.23
of highly substituted derivatives are essential to medicinal chemistry. Here we show that the olefin CM reaction, in combination with an acid cocatalyst or subsequent Heck arylation, provides a concise and flexible entry to 2,5-di- or 2,3,5-tri-substituted furans. These cascade processes portend further opportunities for the regiocontrolled preparation of other highly substituted aromatic and heteroaromatic
烯烃交叉复分解 (CM) 反应广泛用于有机化学,是选择性合成差异取代烯烃产物的有效方法。令人惊讶的是,尚未报道将这一非凡的过程整合到芳香族和杂芳香族构建策略中的努力。这种结构代表了大多数小分子药物化合物的关键要素;高度取代衍生物的受控制备方法对于药物化学是必不可少的。在这里,我们展示了烯烃 CM 反应与酸助催化剂或随后的 Heck 芳基化相结合,为 2,5-二-或 2,3,5-三-取代呋喃提供了简洁而灵活的入口。
Antipicornaviral compounds and compositions, their pharmaceutical uses, and materials for their synthesis
申请人:——
公开号:US20020006943A1
公开(公告)日:2002-01-17
Compounds of the formula:
1
where the formula variables are as defined in the disclosure, advantageously inhibit or block the biological activity of the picomaviral 3C protease. These compounds, as well as pharmaceutical compositions containing these compounds, are useful for treating patients or hosts infected with one or more picomaviruses, such as RVP. Intermediates and synthetic methods for preparing such compounds are also described.
Mesityllithium has proven to be an effective iodine-lithiumexchange reagent. Thus, carbolithiation reactions on 2-alkenyl-substituted N-( O-iodobenzyl)pyrroleshave been accomplished avoiding side reactions to afford pyrroloisoquinolinesin high yields (80-92%), improving the resultsobtained with T-BuLi. The carbolithiationreaction requires the use of electron-deficient alkenes. Mesityllithiumhas also
(±)-chlorizidine A has been achieved in 10 steps. Pd-catalyzed decarboxylative coupling and late-stage oxidation were utilized to construct the 5H-pyrrolo[2,1-a]isoindol-5-one scaffold. Samarium(II) iodide mediated Reformatsky reaction and intramolecular Mitsunobu reactions were efficiently applied for the synthesis of the 2,3-dihydropyrrolizine ring system. Chlorizidine A is highly prone to degradation; hence, methyl-protected
甲基保护的(±)-氯联苯胺A的第一个全合成已通过10个步骤完成。钯催化的脱羧偶联和后期氧化被用来构建5 H-吡咯并[2,1 - a ] isoindol-5-one支架。碘化Sa(II)介导的Reformatsky反应和分子内Mitsunobu反应有效地用于合成2,3-二氢吡咯烷嗪环系统。氯唑烷A极易降解;因此,制备了甲基保护的(±)-氯联苯胺A。
Antipicornaviral compounds and compositions, their uses, and materials for their synthesis
申请人:——
公开号:US20030225042A1
公开(公告)日:2003-12-04
Compounds of the formula:
1
where the formula variables are as defined in the disclosure, advantageously inhibit or block the biological activity of the picornaviral 3C protease. These compounds, as well as pharmaceutical compositions containing these compounds, are useful for treating patients or hosts infected with one or more picornaviruses, such as RVP. Intermediates and synthetic methods for preparing such compounds are also described.