Enantioselective formation of quaternary stereocenters using the catalytic intramolecular Stetter reaction
作者:Jennifer L. Moore、Mark S. Kerr、Tomislav Rovis
DOI:10.1016/j.tet.2006.06.042
日期:2006.12
Asymmetric formation of quaternary stereocenters has been accomplished using the catalyticintramolecular Stetter reaction. A variety of tethered aldehydes and Michael acceptors are cyclized in excellent yields and enantioselectivities.
Enantioselective Synthesis of Quaternary Stereocenters via a Catalytic Asymmetric Stetter Reaction
作者:Mark S. Kerr、Tomislav Rovis
DOI:10.1021/ja047644h
日期:2004.7.1
A new electron-deficient chiraltriazoliumsalt has been shown to catalyze the formation of quaternary stereocenters by an asymmetric intramolecular Stetter reaction. Pentafluorophenyl substitution on an aminoindanol-derived catalyst affords tertiary ether, thioether, and quaternary stereocenters in typically greater than 90% ee and very good chemical yield. Aromatic and aliphatic aldehydes are equally
一种新的缺电子手性三唑盐已被证明可通过不对称分子内 Stetter 反应催化四元立体中心的形成。氨基茚满醇衍生的催化剂上的五氟苯基取代提供了通常大于 90% ee 的叔醚、硫醚和季立体中心和非常好的化学产率。芳香醛和脂肪醛同样是该反应的有效底物。该反应在室温下温和条件下进行,以提供具有其他方法特别难以获得的官能团关系的四元立体中心。
Catalytic Asymmetric Alkylation of Substituted Isoflavanones
作者:Antoinette E. Nibbs、Amanda-Lauren Baize、Rachel M. Herter、Karl A. Scheidt
DOI:10.1021/ol901676f
日期:2009.9.3
selectivity. Isoflavanones are a privileged class of natural products with a broad spectrum of biological activities including insecticidal, antimicrobial, antibacterial, estrogenic, antitumor, and anti-HIV activity.(1) Isoflavanones are also precursors for more complex natural products such as pterocarpans and rotenones.(1) Given their therapeutic promise, selective strategies to access new classes of
异黄酮 (3-aryl-chroman-4-ones) 和受保护的 3-phenyl-2,3-dihydroquinolin-4(1 H ) 的不对称烷基化)-由一种新型辛可尼丁衍生的相转移催化剂 E 催化。这种功能化发生在未活化的 C3 次甲基上,以提供新产品,这些产品可以轻松地功能化以生成更复杂的稠环系统。该过程可容纳各种异黄酮和活化的亲电子试剂,并以高产率和良好的选择性安装立体四元中心。异黄酮是一类特殊的天然产物,具有广泛的生物活性,包括杀虫、抗菌、抗菌、雌激素、抗肿瘤和抗 HIV 活性。(1) 异黄酮也是更复杂的天然产物如紫檀和鱼藤酮的前体。 (1) 鉴于它们的治疗前景,(2) C3 位置的功能化可以促进与感兴趣的生物靶标的有益相互作用。具体来说,C3 处的烷基化可以快速获得具有生物活性的高异黄酮类的新成员。 (3)