可见光诱导的光催化脱氢/6π环化/氧化级联反应将1-(硝基甲基)-2-芳基-1,2,3,4-四氢异喹啉转化为新型的12-硝基取代的四环吲哚[2,1- a ]异喹啉衍生物。各种光催化剂可在空气和碱的存在下促进反应,最有效的是将1-氨基蒽醌与K 3 PO 4结合使用。此外,通过扩展单锅程序与前述的光催化交叉脱氢偶联反应,可直接从C1未官能化的2‐芳基1,2,3,4‐四氢异喹啉中直接获得12‐硝基吲哚异喹啉产物,从而产生四级联反应转型。
DOI:
10.1002/chem.201500612
作为产物:
描述:
硝基甲烷 、 2-(4-nitrophenyl)-1,2,3,4-tetrahydroisoquinoline 在
Rose Bengal-conjugated microporous polymer on the base of 1,4-diethynylbenzene 、 air 作用下,
反应 15.0h,
以87%的产率得到1-(nitromethyl)-2-(4-nitrophenyl)-1,2,3,4-tetrahydroisoquinoline
Highly efficient heterogeneous aerobic oxidative C–C coupling from C<sub>sp3</sub>–H bonds by a magnetic nanoparticle-immobilized bipy–gold(<scp>iii</scp>) catalyst
作者:Weisen Yang、Li Wei、Tao Yan、Mingzhong Cai
DOI:10.1039/c6cy02567f
日期:——
cross-dehydrogenative coupling (CDC) of tertiary amines with nitroalkanes and various unmodified ketones was achieved by using a magnetic nanoparticle-immobilized bipy–gold(III) complex as catalyst and air as the soleoxidant to afford the corresponding C–Ccoupling products in good to excellent yields under mild reaction conditions. The new heterogeneous gold catalyst can easily be separated from the reaction mixture
N-Aryl Groups Are Ubiquitous in Cross-Dehydrogenative Couplings Because They Stabilize Reactive Intermediates
作者:Althea S.-K. Tsang、A. Stephen K. Hashmi、Peter Comba、Marion Kerscher、Bun Chan、Matthew H. Todd
DOI:10.1002/chem.201700430
日期:2017.7.12
mechanism of cross‐dehydrogenative coupling (CDC) reactions has been examined by experimental and computational methods. We provide a rationale for the ubiquity of the N‐arylgroup in these reactions. The aryl substituent stabilizes two intermediates and the high‐energy transition state that connects them, which together represent the rate‐determining step. This knowledge has enabled us to predict whether
Facile synthesis of vicinal diamines via oxidation of N-phenyltetrahydroisoquinolines with DDQ
作者:Althea S.-K. Tsang、Matthew H. Todd
DOI:10.1016/j.tetlet.2008.12.101
日期:2009.3
aromatic ring and the C1 carbon being stronger than with the N-aryl ring. Reduction of the β-nitroamines to the corresponding novel chiral vicinal diamines are straightforward. Examination of the reaction by 1H NMR spectroscopy suggested that the reaction proceeds via an iminium ion, which then reacts with nitromethane upon work-up. This information was used to shorten the required reaction time.
N-苯基四氢异喹啉的氧化在DDQ中迅速发生。在环境条件下和在硝基甲烷的存在下,以良好至优异的产率分离出相应的β-硝基胺衍生物。异喹啉和N-苯基取代基的电子性质的变化表明,可以接受广泛的取代基,异喹啉芳族环和C1碳之间的电子连通比N-芳基环更强。将β-硝基胺还原为相应的新型手性邻二胺是直接的。用1检验反应1 H NMR光谱表明该反应通过亚胺离子进行,该亚胺离子随后在处理后与硝基甲烷反应。该信息用于缩短所需的反应时间。
Mechanistic studies of thiourea-catalyzed cross-dehydrogenative C-P and C-C coupling reactions and their further applications
Thiourea-based hydrogen bond donor has been recently disclosed by our group to be an efficient organocatalyst for cross-dehydrogenative coupling (CDC) reactions. Here we present a detailed mechanistic study of this reaction using NMR spectroscopy and kinetic isotope effect experiment. The results revealed that α-amino peroxide is the true intermediate within the catalytic cycle, formed via a thiourea-catalyzed
A Stable Microporous Mixed-Metal Metal-Organic Framework with Highly Active Cu<sup>2+</sup>Sites for Efficient Cross-Dehydrogenative Coupling Reactions
Two metalloporphyrin octacarboxylates were used to link copper(II) nodes for the formation of two novel porous mixed‐metal metal–organicframeworks (M′MOFs) containing nanopore cages (2.1 nm in diameter) or nanotubular channels (1.5 nm in diameter). The highly active Cu2+ sites on the nanotubular surfaces of the stable porous M′MOF ZJU‐22, stabilized by three‐connected nets, lead to the superior catalytic