multiple stereocenters from the same set of starting materials. We report herein the first diastereodivergent [3+2] annulation of aromatic aldimines with alkenes via C-H activation by half-sandwich rare-earth catalysts. This protocol provides an efficient and general route for the selective synthesis of both trans and cis diastereoisomers of multi-substituted 1-aminoindanes from the same set of aldimines
An efficient one-pot palladium-catalyzed hydroformylation of aryl halides to produce aromatic aldehydes has been achieved, employing tert-butyl isocyanide as a C1 resource and formate salt as a hydride donor without any additional bases. Characterized by its mild reaction conditions, easy operation and lower toxicity, this reaction can tolerate a wide array of functional groups with moderate to excellent
important chemical transformation for oxidation of amines to imines, on account of very important versatile applications of imines in organic synthesis. Here, we develop a convenient way to synthesize carbon doped WO3−x ultrathin nanosheets via an acid-assisted one-pot process. The carbon doped WO3−x ultrathin nanosheets exhibit excellent photocatalytic activity in the aerobic oxidation of amines to corresponding
2D sp
<sup>2</sup>
Carbon‐Conjugated Porphyrin Covalent Organic Framework for Cooperative Photocatalysis with TEMPO
作者:Ji‐Long Shi、Rufan Chen、Huimin Hao、Cheng Wang、Xianjun Lang
DOI:10.1002/anie.202000723
日期:2020.6.2
2D covalentorganicframeworks (COFs) are receiving ongoing attention in semiconductor photocatalysis. Herein, we present a photocatalytic selective chemical transformation by combining sp2 carbon-conjugated porphyrin-based covalentorganicframework (Por-sp2 c-COF) photocatalysis with TEMPO catalysis illuminated by 623 nm red light-emitting diodes (LEDs). Highly selective conversion of amines into
Intramolecular C(sp<sup>3</sup>)N Coupling by Oxidation of Benzylic C,N-Dianions
作者:Jenna L. Jeffrey、Emily S. Bartlett、Richmond Sarpong
DOI:10.1002/anie.201209591
日期:2013.2.18
azacycles is reported. This reaction proceeds through the oxidation of benzylic C,N‐dianions with iodine and builds on an earlier discovery during the synthesis of the natural product lyconadin A. The current study employs conformationally unbiased substrates with less acidic CH bonds and less reactive nitrogen nucleophiles. ZnCl2 was identified as an important additive.
多么一对!据报道,分子内 C(sp 3 ) N 偶联可提供氮杂环。该反应通过用碘氧化苄型 C,N-二价阴离子进行,并建立在合成天然产物 lyconadin A 期间的早期发现的基础上。目前的研究使用具有较低酸性 C H 键和较低活性氮亲核试剂的构象无偏底物. ZnCl 2被确定为一种重要的添加剂。