N-Substitution dependent stereoselectivity switch in palladium catalyzed hydroalkynylation of ynamides: a regio and stereoselective synthesis of ynenamides
作者:Vikas Dwivedi、Madala Hari Babu、Ruchir Kant、Maddi Sridhar Reddy
DOI:10.1039/c5cc06251a
日期:——
A palladium catalysed regioselective hydroalkynylation of ynamides for ynenamides is achieved with an N-substitution dependent stereoselectivity switch.
通过钯催化的选择性加氢炔化反应,可以将炔酰胺转化为烯酰胺,其立体选择性取决于N-取代基的选择。
Zinc-Catalyzed Alkyne–Carbonyl Metathesis of Ynamides with Isatins: Stereoselective Access to Fully Substituted Alkenes
作者:Chaoqun Ao、Xiaohan Yang、Shikun Jia、Xinfang Xu、Yanqiu Yuan、Dan Zhang、Wenhao Hu
DOI:10.1021/acs.joc.9b02350
日期:2019.12.6
A zinc-catalyzed intermolecular alkyne-carbonyl metathesis reaction of ynamides with isatins followed by an amide to ester conversion has been developed, which produces the indolone derivatives with a fully substituted alkene species in good to high yields. The salient features of this reaction include the following: mild reaction conditions, an inexpensive zinc catalyst, a broad substrate scope, the
A facile route to obtain ynamides in high yields was described. The products were achieved through the iron-catalyzed C-N coupling reaction of amides with alkynyl bromides in the presence of 20 mol % of N,N'-dimethylethane-1,2-diamine (DMEDA).
Lewis Acid Catalyzed Electrophilic Aminomethyloxygenative Cyclization of Alkynols with <i>N</i>,<i>O</i>-Aminals
作者:Anrong Chen、Houjian Yu、Jiaqi Yan、Hanmin Huang
DOI:10.1021/acs.orglett.9b04630
日期:2020.1.17
Lewis acid enables the electrophilic carbooxygenative cyclization of alkynols with N,O-aminals. The new process proceeds efficiently under very mild conditions via a pathway that is opposite to classical carbo-metalation. These reactions exhibit broad substrate generality and functional group compatibility, leading to a wide variety of 5-8-membered oxacycles bearing diverse functional groups. The cyclization
Zinc-Catalyzed Alkyne Oxidation/CH Functionalization: Highly Site-Selective Synthesis of Versatile Isoquinolones and β-Carbolines
作者:Long Li、Bo Zhou、Yong-Heng Wang、Chao Shu、Yi-Fei Pan、Xin Lu、Long-Wu Ye
DOI:10.1002/anie.201502553
日期:2015.7.6
An efficient zinc(II)‐catalyzed alkyne oxidation/CH functionalization sequence was developed, thus leading to highly site‐selective synthesis of a variety of isoquinolones and β‐carbolines. Importantly, in contrast to the well‐established gold‐catalyzed intermolecular alkyne oxidation, over‐oxidation can be completely suppressed in this system and the reaction most likely proceeds by a Friedel–Crafts‐type
一种有效的锌(II) -催化的炔氧化/ C ħ官能序列被开发,因此导致多种异喹诺酮和β咔啉的高度位点选择性合成。重要的是,与公认的金催化的分子间炔烃氧化相反,该体系中的过氧化可以被完全抑制,并且反应很可能通过Friedel-Crafts型途径进行。描述了力学研究和理论计算。