Copper(0)/PPh<sub>3</sub>-Mediated Bisheteroannulations of <i>o</i>-Nitroalkynes with Methylketoximes Accessing Pyrazo-Fused Pseudoindoxyls
作者:Huanxin Meng、Zhenhua Xu、Zhonghua Qu、Huawen Huang、Guo-Jun Deng
DOI:10.1021/acs.orglett.0c02180
日期:2020.8.7
A copper(0)/PPh3-mediated cascade bisheteroannulation reaction of o-nitroalkynes with methylketoximes has been developed that provides viable access to a diverse range of pyrazo-fused pseudoindoxyl compounds. Synthetically useful functional groups including sensitive C–I bonds are compatible with this system. Mechanistic studies suggest a reaction cascade involving sequential PPh3-mediated deoxygenative
Energy Transfer Photocatalytic Radical Rearrangement in <i>N</i>-Indolyl Carbonates
作者:Milan Bera、Ho Seong Hwang、Tae-Woong Um、Soo Min Oh、Seunghoon Shin、Eun Jin Cho
DOI:10.1021/acs.orglett.2c00085
日期:2022.3.11
A new type of sp3-like N-centered radical has been generated by selective energy transfer catalysis. Upon photoexcitation, homolytic N–O bond cleavage of N-indolyl carbonate in the presence of an Ir complex produced N- and O-centered radicals. The high spin density at the C3 position of indole led to radical recombination with the O-centered radical, affording valuable 3-oxyindole derivatives without
通过选择性能量转移催化产生了一种新型的sp 3类N 中心自由基。在光激发下,在 Ir 配合物存在下N-吲哚碳酸酯的均裂 N-O 键断裂产生以 N 和 O 为中心的自由基。吲哚 C3 位的高自旋密度导致自由基与以 O 为中心的自由基复合,从而提供有价值的 3-氧吲哚衍生物而无需脱羧。还证明了所需产物向各种分子的转化。
One-Pot Synthesis of Indole Derivatives from the Reaction of Nitroalkynes and Alkynes via a Mercury-Carbene Intermediate
作者:Shifa Zhu、Min Zheng、Kai Chen
DOI:10.1055/s-0036-1588416
日期:2017.9
Published as part of the Special Topic Modern Cyclization Strategies in Synthesis Abstract The cyclization of nitroalkyne catalyzed by Hg(OTf)2 to produce the corresponding benzo[c]isoxazole in excellent yields with high selectivity is reported. On the basis of this strategy, a one-pot method to synthesize indolederivatives has been developed. In this transformation, two Hg-carbene intermediates are
作为专题“现代合成中的环化策略”的一部分发布 抽象的 据报道,Hg(OTf)2催化硝基炔的环化反应,以高收率和高选择性产生相应的苯并[ c ]异恶唑。在这种策略的基础上,开发了一种一锅合成吲哚衍生物的方法。在该转化中,提出了涉及两个Hg-卡宾中间体。 据报道,Hg(OTf)2催化硝基炔的环化反应,以高收率和高选择性产生相应的苯并[ c ]异恶唑。在这种策略的基础上,开发了一种一锅合成吲哚衍生物的方法。在该转化中,提出了涉及两个Hg-卡宾中间体。
Synthesis of Aryl Alkynes via Copper Catalyzed Decarboxylative Alkynylation of 2-Nitrobenzoic Acids
An efficient protocol for the synthesis of internal aryl alkynes was achieved via Cu-catalyzed decarboxylativecross-coupling reactions, and to the best of our knowledge, this is the first example of a Cu-catalyzed decarboxylative alkynylation of benzoic acids with terminal alkynes. This approach utilizes simple Cu salt as catalyst and O2, an abundant, clean, and green material, as the oxidant. The