A robust transition-metal-free one-step strategy for the synthesis of ynamides from sulfonamides and (Z)-1,2-dichloroalkenes or alkynyl chlorides is presented. This method is not only effective for internal ynamides but also amenable for terminal ynamides. Various functional groups, even the vinyl moiety, are compatible, and thus, this strategy offers the opportunity for further functionalization.
Integration of multiple active sites on large-pore mesoporous silica for enantioselective tandem reactions
作者:Xuelin Xia、Jingjing Meng、Hanxin Wu、Tanyu Cheng、Guohua Liu
DOI:10.1039/c6cc09008g
日期:——
Facile construction of a multifunctional heterogeneous catalyst through assembly of Au/carbene and chiral ruthenium/diamine dual complexes in a large-pore mesoporous silica is developed. It enables an efficient one-pot hydration-asymmetric transfer...
One-Pot Cascade Hydration-Asymmetric Transfer Hydrogenation as a Practical Strategy to Construct Chiral β-Adrenergic Receptor Blockers
作者:Qunqun Ye、Tanyu Cheng、Yuxi Zhao、Junwei Zhao、Ronghua Jin、Guohua Liu
DOI:10.1002/cctc.201500409
日期:2015.6.15
the Au‐catalyzed hydration of aryl‐substituted haloalkynes to aryl‐substituted α‐halomethyl ketones and the Ru‐catalyzed asymmetrictransferhydrogenation of aryl‐substituted α‐halomethyl ketones to aryl‐substituted 2‐haloethanols. The significant benefits of this procedure are that it provides chiral aromatic halohydrins in high yields, with excellent enantioselectivities, and a wide variety of functional
Visible Light‐Enabled sp
<sup>3</sup>
‐C−H Functionalization with Chloro‐ and Bromoalkynes: Chemoselective Route to Vinylchlorides or Alkynes
作者:Tapas Adak、Marvin Hoffmann、Sina Witzel、Matthias Rudolph、Andreas Dreuw、A. Stephen K. Hashmi
DOI:10.1002/chem.202001259
日期:2020.12
valuable vinyl chlorides. The photo‐organocatalytic hydrogen atom transfer strategy gives rise to a broad range of diversely functionalized olefins. When bromoalkynes are applied in the presence of a base, a chemoselectivity switch to an alkynylation is observed. This reaction can even be performed for the alkynylation of unactivated sp3‐C−H bonds, in this case with a preference of the more substituted
实现了氯炔的前所未有的直接原子经济化学和区域选择性加氢烷基化和溴炔的 sp 3 -C-H 炔基化。反应伙伴是未官能化的醚、醇、酰胺,甚至未活化的烃。我们发现家用荧光灯能够激发二芳基酮,然后二芳基酮选择性地从 sp 3 ‐C−H 键中提取 H 原子。用氯炔获得正式炔插入 sp 3 ‐C−H 键的产物,从而提供有价值的氯乙烯。光有机催化氢原子转移策略产生了多种不同官能化的烯烃。当在碱存在下应用溴代炔时,观察到化学选择性转变为炔基化。该反应甚至可以用于未活化的 sp 3 -C-H 键的炔基化,在这种情况下优选取代更多的碳。伴随的量子化学计算表明乙烯基自由基中间体与碳自由基中心具有明显的线性配位,从而能够在H原子抽象后形成两种非对映异构体,表明( Z )-非对映异构体是优选的,这支持了实验观察到的( E / Z )‐分布。
Compounds and methods
申请人:——
公开号:US20030220371A1
公开(公告)日:2003-11-27
Compounds of this invention are non-peptide, reversible inhibitors of type 2 methionine aminopeptidase, useful in treating conditions mediated by angiogenesis, such as cancer, haemangioma, proliferative retinophathy, rheumatoid arthritis, atherosclerotic neovascularization, psoriasis, ocular neovascularization and obesity.