for the synthesis of [1,4]thiazino[4,3-a]indole derivatives using sodium chlorodifluoroacetate (ClCF2CO2Na) and elemental sulfur as the difluoromethylthiolating reagent system has been developed. Three-component reactions of 2′-aminochalcones, sulfur, and ClCF2CO2Na under basic conditions using TEMPO as the oxidant afforded [1,4]thiazino[4,3-a]indol-10-ones containing a difluoromethyl thioether moiety
已经开发了一种使用氯二氟乙酸钠 (ClCF 2 CO 2 Na) 和元素硫作为二氟甲基硫醇化试剂系统合成 [1,4] 噻嗪并 [4,3- a ] 吲哚衍生物的有效方法。在碱性条件下,使用 TEMPO 作为氧化剂,2'-氨基查耳酮、硫和 ClCF 2 CO 2 Na 的三组分反应得到含有二氟甲基硫醚部分的[1,4] 噻嗪基 [4,3 - a ] 吲哚-10-酮收益良好。在顺序转化过程中选择性地形成四个键,包括一个 C-N、两个 C-S 和一个 C-C 键。
Enantioselective Synthesis of Azaflavanones Using Organocatalytic 6-<i>endo</i>Aza-Michael Addition
作者:Shuanghua Cheng、Lili Zhao、Shouyun Yu
DOI:10.1002/adsc.201300920
日期:2014.3.24
A method to prepare highly enantioenriched azaflavanonesusing an organocatalytic 6‐endo aza‐Michael addition has been described. A variety of 2‐aryl‐, 2‐vinyl‐ and 2‐methylazaflavanones were prepared in good yields (53–84%) and excellent enantioselectivities (97.6:2.4 to 99.3:0.7 er).
p-TsOH-promoted synthesis of (E)-6-phenyl-7-styryl-5,6-dihydrodibenzo[b,h][1,6]naphthyridines via cascade intramolecular aza-Michael addition/Friedlander condensation of 2′-aminochalcones in a SDS/H<sub>2</sub>O system
作者:Makthala Ravi、Parul Chauhan、Shikha Singh、Ruchir Kant、Prem. P. Yadav
DOI:10.1039/c6ra04837d
日期:——
Brønsted acid-promoted cascade synthesis of novel (E)-6-phenyl-7-styryl-5,6-dihydrodibenzo[b,h][1,6]naphthyridines has been achieved via homodimerization of 2′-aminochalcones by employing sodium dodecylsulphate (SDS) as a surfactant in water. Besides water as an environmentally benign reaction medium, the reaction proceeds smoothly with high atom-economy under a sequential one-pot protocol.
A Brønsted acid-promoted asymmetric intramolecular allylic amination of alcohols
作者:Jianqiao Zhou、Hexin Xie
DOI:10.1039/c7ob02599h
日期:——
Reported herein is a chiral Brønsted acid-catalyzed asymmetric intramolecularallylicaminationreaction, allowing facile access to a range of biologically interesting chiral 2-substituted hydroquinolines in up to 90% yield and with up to 93% ee. Furthermore, a significant effect of an N-protecting group was observed in this asymmetric process.
Copper(II)-Catalyzed Synthesis of Pyrrolo[3,4-<i>b</i>]quinolinediones from <i>o</i>-Amino Carbonyl Compounds and Maleimides
作者:Dhananjay S. Nipate、Krishnan Rangan、Anil Kumar
DOI:10.1021/acs.orglett.3c00240
日期:2023.3.3
A copper(II)-catalyzed cascade synthesis of 1H-pyrrolo[3,4-b]quinoline-1,3(2H)-diones has been achieved from readily available o-amino carbonyl compounds and maleimides. This one-potcascade strategy involves a copper-catalyzed aza-Michael addition followed by condensation and oxidation to deliver the target molecules. The protocol features a broad substrate scope and excellent functional group tolerance
铜 (II) 催化的 1 H-吡咯并 [3,4- b ] 喹啉-1,3(2 H )-二酮的级联合成已经从容易获得的邻氨基羰基化合物和马来酰亚胺中实现。这种单锅级联策略涉及铜催化的氮杂-迈克尔加成,然后进行缩合和氧化以传递目标分子。该协议具有广泛的底物范围和出色的官能团耐受性,并提供中等至良好 (44–88%) 产量的产品。