在本文中,我们报告了2-氨基查尔酮与可见光驱动的双功能亲核试剂的串联环异构化/亲核加成/环化反应。这种级联过程是通过在室温下照射蓝色LED来实现的,这为结构上多样化的苯并[ d ] [1,3]恶唑啉骨架提供了一条简洁的途径。机理研究表明,反应是在可见光照射下,由C–C双键的E到Z异构化开始的,然后环化/再芳构化以生成瞬态喹啉中间体,该中间体被亲核试剂捕获并环化生成多环苯并[ d ] [1,3]恶唑啉。
在本文中,我们报告了2-氨基查尔酮与可见光驱动的双功能亲核试剂的串联环异构化/亲核加成/环化反应。这种级联过程是通过在室温下照射蓝色LED来实现的,这为结构上多样化的苯并[ d ] [1,3]恶唑啉骨架提供了一条简洁的途径。机理研究表明,反应是在可见光照射下,由C–C双键的E到Z异构化开始的,然后环化/再芳构化以生成瞬态喹啉中间体,该中间体被亲核试剂捕获并环化生成多环苯并[ d ] [1,3]恶唑啉。
Synthesis of 2-Substituted Quinolines from 2-Aminostyryl Ketones Using Iodide as a Catalyst
作者:So Young Lee、Jiye Jeon、Cheol-Hong Cheon
DOI:10.1021/acs.joc.8b00552
日期:2018.5.4
A new protocol for the synthesis of 2-substituted quinolinesfrom 2-aminostyryl ketones has been developed using iodide as a nucleophilic catalyst. Conjugate addition of iodide to 2-aminostyryl ketones yielded the corresponding β-iodoketones, which could have a conformation where the amino and carbonyl groups are proximal through free rotation about the Cα–Cβ single bond. Subsequent condensation between
On-Water Synthesis of 2-Substituted Quinolines from 2-Aminochalcones Using Benzylamine as the Nucleophilic Catalyst
作者:So Young Lee、Cheol-Hong Cheon
DOI:10.1021/acs.joc.8b01675
日期:2018.11.2
On-water synthesis of 2-substituted quinolines from 2-aminochalcone derivatives was developed using benzylamine as the nucleophilic catalyst. Various 2-aminochalcones could be applied to this protocol, and the desired 2-substituted quinoline products were isolated in excellent yields by simple filtration. Furthermore, we elucidated the role of benzylamine in this transformation and provided the detailed
A blue-light-promoted carbon-carbon double bondisomerization in the absence of any photoredox catalyst is reported. It provides rapid access to a series of quinolines in good to excellent yields under simple aerobic conditions. The protocol is direct, catalyst-free and operationally convenient.
A new cross‐cycloaddition reaction between a wide range of isocyanides and 2‐isocyanochalcones (or analogues) was developed for the expeditious synthesis of pyrrolo[3,4‐b]indoles under thermal conditions. On the basis of the experimental results and DFT calculations, a mechanism for this domino reaction is proposed involving chemoselective heterodimerization of two different isocyanides to form 1,4‐diazabutatriene
An efficient asymmetric intramolecular trapping of ammonium ylides of α-diazoketones with enones to synthesize indoline derivatives was realized. A Rh(II)/chiralN,N′-dioxide−Sc(III) complex bimetallic relay catalytic system was established. A series of optically active 2,2,3-trisubstituted indolines were obtained in high yields (up to 99%), good enantioselectivities (up to 99% ee), and excellent