Cobalt-Catalyzed Allylation of Amides with Styrenes Using DMSO as Both the Solvent and the α-Methylene Source
作者:Xu Zhang、Zhi Zhou、Huiying Xu、Xuefeng Xu、Xiyong Yu、Wei Yi
DOI:10.1021/acs.orglett.9b02462
日期:2019.9.20
An efficient synthesis of privileged allylic amines has been developed via cobalt-catalyzed allylation of amides with styrenes, in which DMSO was used as both the solvent and the α-methylene source. This transformation features high yields, and selectivity for the (E)-isomer of the linear product. Through the experimental and computational investigations, a sequential K2S2O8-mediated oxidative cou
通过将酰胺与苯乙烯进行钴催化的烯丙基化反应,已经开发了一种有效的特权烯丙基胺的合成方法,其中DMSO既用作溶剂,又用作α-亚甲基源。该转化具有高收率和对线性产物的(E)-异构体的选择性。通过实验和计算研究,还推导了顺序的K 2 S 2 O 8介导的氧化偶联/钴辅助的区域选择性烯烃插入/β-H消除/烯烃解离/氢化物转移过程。
Visible-Light-Promoted Photocatalyst-Free Hydroacylation and Diacylation of Alkenes Tuned by NiCl<sub>2</sub>·DME
作者:Xinxin Zhao、Bing Li、Wujiong Xia
DOI:10.1021/acs.orglett.9b04595
日期:2020.2.7
4-dihydropyridines via an acyl radical addition and hydrogen atom transfer pathway under photocatalyst-free conditions. The efficiency was highlighted by wide substrate scope, good to high yields, successful scale-up experiments, and expedient preparation of highly functionalized ketone derivatives. In addition, this protocol allows for the synthesis of 1,4-dicarbonyl compounds through alkene diacylation in the presence
Visible-Light-Promoted Metal-Free Aerobic Hydroxyazidation of Alkenes
作者:Bo Yang、Zhan Lu
DOI:10.1021/acscatal.7b02892
日期:2017.12.1
A highly efficient visible-light-promoted metal-free aerobic hydroxyazidation of alkenes has been developed. This protocol was operationally simple with broad substrate scope using relatively simple and readily available starting materials, such as alkenes and air, to construct valuable β-azido alcohols which are significant building blocks to build N-containing compounds. The distinct possible mechanisms
Sunlight-driven trifluoromethylation of olefinic substrates by photoredox catalysis: A green organic process
作者:Munetaka Akita、Takashi Koike
DOI:10.1016/j.crci.2015.01.013
日期:2015.7
types of catalytic photoredox processes following the reductive quenching cycle (RQC) and the oxidative quenching cycle (OQC), the discussion is focused on organic transformations based on OQC, in particular the trifluoromethylation of olefinic substrates with electrophilic trifluoromethylating reagents furnishing solvolytic addition products and substitution products. It is concluded that catalytic
Abstract Silicachloride (SiO2-Cl), as a heterogeneous reagent, has been used for the efficient dehydration of tertiary alcohols under mild reaction conditions. For comparison, we have also used trimethylsilyl chloride (TMSCl) as a homogeneous reagent for this purpose. We have found that silicachloride is a more efficient reagnet than trimethylsilyl chloride for this purpose. Handling of SiO2-Cl is