Microtubing-Reactor-Assisted Aliphatic C−H Functionalization with HCl as a Hydrogen-Atom-Transfer Catalyst Precursor in Conjunction with an Organic Photoredox Catalyst
作者:Hong-Ping Deng、Quan Zhou、Jie Wu
DOI:10.1002/anie.201804844
日期:2018.9.24
Chlorine radical, which is classically generated by the homolysis of Cl2 under UV irradiation, can abstract a hydrogenatomfrom an unactivated C(sp3)−H bond. We herein demonstrate the use of HCl as an effective hydrogen‐atom‐transfer catalyst precursor activated by an organic acridinium photoredox catalyst under visible‐light irradiation for C−H alkylation and allylation. The key to success relied
Electrochemical Synthesis of Allylamines via a Radical Trapping Sequence
作者:Cao‐Cao Sun、Fei Lian、Kun Xu、Cheng‐Chu Zeng、Bao‐Guo Sun
DOI:10.1002/adsc.201900537
日期:2019.9.3
oxidative addition of sulfonamides and imide to allyl sulfones was developed for the facilesynthesis of synthetically useful allylamines. This method avoids the use of transition metal catalysts and additional bases, which are commonly used for the synthesis of allylamines. Moreover, cheap and easily available NaI was employed as the mediator without use of an external supporting electrolyte. Radical
Generation of Dithianyl and Dioxolanyl Radicals Using Photoredox Catalysis: Application in the Total Synthesis of the Danshenspiroketallactones via Radical Relay Chemistry
作者:Yifan Deng、Minh D. Nguyen、Yike Zou、K. N. Houk、Amos B. Smith
DOI:10.1021/acs.orglett.9b00271
日期:2019.3.15
Visible-light-induced generation of dithianyl and dioxolanyl radicals via selective hydrogen atom transfer (HAT) has been achieved. This radical relay tactic enables remote C(sp3)–H functionalization to permit rapid access to polyol and spiroketal segments, and in turn has been exploited as a key synthetic construct in the total synthesis of the danshenspiroketallactones. The conformational stability
Catalyst‐Free Deaminative Functionalizations of Primary Amines by Photoinduced Single‐Electron Transfer
作者:Jingjing Wu、Phillip S. Grant、Xiabing Li、Adam Noble、Varinder K. Aggarwal
DOI:10.1002/anie.201814452
日期:2019.4.16
The use of pyridinium‐activated primary amines as photoactive functional groups for deaminative generation of alkyl radicals under catalyst‐free conditions is described. By taking advantage of the visible light absorptivity of electron donor–acceptor complexes between Katritzky pyridiniumsalts and either Hantzsch ester or Et3N, photoinduced single‐electron transfer could be initiated in the absence
Synthesis of quaternary centres by single electron reduction and alkylation of alkylsulfones
作者:Masakazu Nambo、Yasuyo Tahara、Jacky C.-H. Yim、Daisuke Yokogawa、Cathleen M. Crudden
DOI:10.1039/d1sc00133g
日期:——
A new method for the generation of tertiary radicals through single electron reduction of alkylsulfones promoted by Zn and 1,10-phenanthroline has been developed. These radicals could be employed in the Giese reaction, affording structurally diverse quaternary products in good yields. With the high modularity and functional group compatibility of sulfones, the utility of this method was demonstrated