Pd-EnCat<sup>TM</sup>TPP30 as a Catalyst for the Generation of Highly Functionalized Aryl- and Alkenyl-Substituted Acetylenes via Microwave-Assisted Sonogashira Type Reactions
作者:Jörg Sedelmeier、Steven V. Ley、Heiko Lange、Ian R. Baxendale
Mn(OAc)<sub>3</sub>-Mediated Unexpected Cycloannulative Sulfonyl Migration Cascade using (<i>E</i>)-β-Iodovinyl Sulfones and <i>ortho</i>-Alkynylphenols for Direct Synthesis of Chromene-Derived Vinyl Sulfones
oxa-Michael addition–elimination of (E)-β-iodovinyl sulfones with ortho-alkynylphenols, followed by cycloisomerization and unique stereoselective sulfonyl migration in one-pot, is realized under the influence of Mn(OAc)3·2H2O. A broad range of vinyl sulfone-tethered chromenes were readily accessed in moderate to high yields with good functional group compatibility. Notably, the reaction was robust at
Flexible Synthesis of Benzofuranones from
<i>ortho</i>
‐Alkynyl Phenols or Benzofurans
作者:Wenqian Du、Rongjie Yang、Jiawen Wu、Zhonghua Xia
DOI:10.1002/ejoc.202201497
日期:2023.2.17
mild conditions. One protocol for benzofuranone is a gold-catalyzed cycloisomerization of o-alkynyl phenol with alcohol or acid. Another metal-free synthesis of benzofuranone is the treatment of benzofuran with alcohol, acid, or H2O.
开发了两种合成苯并呋喃-3(2H)-酮的灵活方法,具有易于获得的起始原料、良好的化学选择性和非常温和的条件。苯并呋喃酮的一种方案是金催化的邻炔基苯酚与醇或酸的环化异构化。苯并呋喃酮的另一种无金属合成是用醇、酸或 H 2 O处理苯并呋喃。
Pd(II)-Catalyzed Tandem Cycloannulative-Alkenylation of <i>o</i>-Alkynyl-Phenols/Anilines with (<i>E</i>)-β-Iodovinyl Sulfones: A Direct Strategy To Construct 3-(Vinyl sulfonyl)benzoheterole Derivatives
cross-coupling is enabled for the diversity-oriented synthesis of vinyl sulfone-tethered benzofurans and indoles in good to high yields with excellent stereoselectivity. Notably, this tandem process was consistent at the gram scale, and in situ, generation of 2-(phenylethynyl)phenol has also been utilized in a scalable synthesis. Late-stage synthetic transformations were also further explored, including isomerization
苯并杂环和乙烯基砜是最有前途的药物相关基序,但这些支架的混合类似物仍需要探索。我们在此报道了在温和反应条件下,Pd(OAc) 2催化的邻炔基酚/邻炔基苯胺与( E )-β-碘乙烯基砜的通用且高效的分子内环化和乙烯基化。直接 C(sp 2 )–C(sp 2) 交叉偶联可实现乙烯基砜系苯并呋喃和吲哚的多样性导向合成,收率良好至高,且具有优异的立体选择性。值得注意的是,这种串联过程在克规模上是一致的,并且原位生成 2-(苯基乙炔基)苯酚也已用于可扩展的合成中。还进一步探索了后期合成转化,包括异构化和脱磺酰化-磺酰化。此外,还完成了一些控制实验,并根据现有实验结果提出了一种合理的机制。