Nitrative Spirocyclization Mediated by TEMPO: Synthesis of Nitrated Spirocycles from<i>N</i>-Arylpropiolamides,<i>tert</i>-Butyl Nitrite and Water
作者:Xu-Heng Yang、Xuan-Hui Ouyang、Wen-Ting Wei、Ren-Jie Song、Jin-Heng Li
DOI:10.1002/adsc.201400895
日期:2015.4.13
A new method for the nitrativespirocyclization of alkynes is described. This method involves the oxidative difunctionalization of alkynes initiated by a radical attack pathway using t‐BuONO (tert‐butyl nitrite) combined with water as the nitro source and TEMPO [(2,2,6,6‐tetramethyl‐piperidin‐1‐yl)oxyl] as the initiator, and it represents a new example of oxidative alkyne difunctionalization via the
描述了炔烃硝化螺环化的新方法。该方法涉及使用叔丁基醚(亚硝酸叔丁酯)与水作为硝基源和TEMPO [[2,2,6,6-四甲基哌啶-1-基]的自由基攻击途径引发的炔烃的氧化双官能化。)氧基]作为引发剂,和它代表氧化炔difunctionalization的一个新的例子经由形成ç N / C C键的的硝基烯烃组件容纳单元-螺环。
The merger of electro-reduction and hydrogen bonding activation for a radical Smiles rearrangement
作者:Liyuan Lan、Kun Xu、Chengchu Zeng
DOI:10.1039/d4sc02821j
日期:——
The reductive activation of chemical bonds at less negative potentials provides a foundation for high functional group tolerance and selectivity, and it is one of the central topics in organic electrosynthesis. Along this line, we report the design of a dual-activation mode by merging electro-reduction with hydrogen bonding activation. As a proof of principle, the reduction potential of N-phenylpropiolamide
Metal-Free Oxidative <i>Ipso</i>-Carboacylation of Alkynes: Synthesis of 3-Acylspiro[4,5]trienones from <i>N</i>-Arylpropiolamides and Aldehydes
作者:Xuan-Hui Ouyang、Ren-Jie Song、Yang Li、Bang Liu、Jin-Heng Li
DOI:10.1021/jo5005982
日期:2014.5.16
A general and metal-free radical route to synthesis of 3-acylspiro[4,5]trienones is established that utilizes TBHP (tert-butyl hydrogenperwdde) as an oxidation and a reaction partner to trigger the oxidative ipso-carboacylation of N-arylpropiolamides with aldehydes. This method offers a new difunctionalization of alkynes through oxidative cross coupling of the aldehyde C(sp(2))-H bond with an ipso-aromatic carbon.
Copper-Catalyzed Oxidative <i>ipso</i>-Annulation of Activated Alkynes with Silanes: An Approach to 3-Silyl Azaspiro[4,5]trienones
作者:Pin Gao、Wanwan Zhang、Zhicheng Zhang
DOI:10.1021/acs.orglett.6b02781
日期:2016.11.18
A novel strategy of silylation and dearomatization of activated alkynes with silanes to synthesize azaspiro[4,5]trienones is developed, which could be facilely achieved through a tandem difunctionalization of alkyne, dearomatization, and oxidation and provided a facile approach to produce useful 3-silyl azaspiro[4,5]trienones in an efficient manner.