Synthesis of Polysubstituted Pyrroles from Activated Alkynes and<i>N</i>-Propargylamines through Base-Catalyzed Cascade Reaction
作者:Jianquan Weng、Yong Chen、Binjie Yue、Meng Xu、Hongwei Jin
DOI:10.1002/ejoc.201500166
日期:2015.5
A novel K3PO4-catalyzed synthesis of polysubstitutedpyrroles by a Michael addition/alkyne carbocyclization of activatedalkynes and N-propargylamines has been developed. This transition-metal-free cascade process represents an environmental friendly and efficient way to construct polysubstitutedpyrroles in good yields. Catalyzed by CsF, a Michael addition/aza-Claisen rearrangement/cyclization sequential
react with carbondioxide and terminal alkynes in the presence of a catalytic amount of 4-1,5-cyclooctadiene) (6-1,3,5-cyclooctatriene)ruthenium [Ru(COD)(COT)] and tertiary phosphine in toluene to give enol carbamates in good yields with high regio- and stereoselectivity. Cyclic enol carbamates, 5-methylene-2-oxazolidinones are obtained from N-substituted propargylamines and carbondioxide in high yields
noble-metal catalysts. Importantly, this is the first report of heterogeneously catalyzed green conversion of propargylamines with CO2 without solvents and co-catalysts under low temperature and atmospheric pressure. A mechanisticstudy reveals that a triply synergistic catalytic effect between CuI/CuII and uncoordinated amino groups promotes highly efficient and green conversion of CO2. Furthermore
炔丙胺与CO 2环化得到2-恶唑烷酮杂环化合物是工业上必不可少的反应,但通常在苛刻条件下以有机碱为助催化剂的贵金属催化剂催化。我们合成了一种独特的 Cu I /Cu II混合价铜基骨架 [(Cu I 6 I 5 )Cu 3 II L 6 (DMA) 3 ](NO 3 )⋅9DMA} n ( 1 ),具有良好的溶剂和热稳定性,以及均匀分布在大纳米通道中的高密度未配位氨基。催化实验表明1能有效催化炔丙胺与CO 2的反应,产率可达99%。周转频率(TOF)达到创纪录的 230 h -1,远高于报道的贵金属催化剂。重要的是,这是在低温和大气压下,在没有溶剂和助催化剂的情况下,用CO 2非均相催化炔丙胺绿色转化的首次报道。机理研究表明,Cu I /Cu II与未配位氨基之间的三重协同催化作用促进了CO 2 的高效绿色转化。此外,1当使用模拟烟气作为 CO 2源时,直接高效地催化该反应。
Benzazepine Dicarboxamide Compounds
申请人:Hoffmann-La Roche Inc.
公开号:US20160257653A1
公开(公告)日:2016-09-08
This invention relates to novel benzazepine dicarboxamide compounds of the formula
wherein R
1
to R
4
are as defined in the description and in the claims, as well as pharmaceutically acceptable salts thereof. These compounds are TLR agonists and may therefore be useful as medicaments for the treatment of diseases such as cancer, autoimmune diseases, inflammation, sepsis, allergy, asthma, graft rejection, graft-versus-host disease, immunodeficiencies, and infectious diseases.
Synthesis of Imidazole Derivatives by Cascade Reaction: Base-Mediated Addition/Alkyne Hydroamination of Propargylamines and Carbodiimides
作者:Hong-Wei Jin、Jian-Hong Jia、Chao Yu、Meng Xu、Jia-Wei Ma
DOI:10.1055/s-0034-1378787
日期:——
regioselectivity and moderate to good yields. A novel synthesis of 2-iminoimidazoles and 2-aminoimidazoles, via nucleophilic addition and a subsequent sodium hydroxide mediated intramolecular alkyne hydroamination from propargylamines and carbodiimides, is developed. This transition-metal-free cascade process represents an atom-economic and step-economic procedure for the construction of imidazole derivatives with