Rhodium-Catalyzed Room Temperature C–C Activation of Cyclopropanol for One-Step Access to Diverse 1,6-Diketones
摘要:
A rhodium-catalyzed room temperature C-C activation of cyclopropanol has been demonstrated for the single-step synthesis of a range of electronically and sterically distinct 1,6-diketones. This reaction proceeds efficiently in shorter reaction time following a highly atom-economical pathway. To illustrate the synthetic potential of 1,6-diketones, aldol and macrocyclization reactions have been successfully demonstrated. Preliminary mechanistic studies revealed the involvement of nonradical pathways.
Palladium-Catalyzed Hydroalkylation of Alkynes with Cyclopropanols: Access to γ,δ-Unsaturated Ketones
作者:Hao Liu、Zhiyuan Fu、Shang Gao、Yue Huang、Aijun Lin、Hequan Yao
DOI:10.1002/adsc.201800200
日期:2018.8.17
A palladium‐catalyzed hydroalkylation of alkynes with cyclopropanols has been developed. This reaction provided a straightforward way to the synthesis of γ,δ‐unsaturated ketones in moderate to good yields, exhibiting high atom economy and Z/E selectivity. Deuterated tri‐substituted alkenes could also be expediently produced by using deuterium oxide as a co‐solvent.
Copper-mediated tandem ring-opening/cyclization reactions of cyclopropanols with aryldiazonium salts: synthesis of <i>N</i>-arylpyrazoles
作者:Jidan Liu、Erjie Xu、Jinyuan Jiang、Zeng Huang、Liyao Zheng、Zhao-Qing Liu
DOI:10.1039/c9cc09657d
日期:——
A general method for the synthesis of structurally diverse N-arylpyrazoles from readily available cyclopropanols and aryldiazonium salts is disclosed. The reaction was conducted at room temperature within minutes with a broad substrate scope and excellent regioselectivity.
Transition-metal free alkylarylation of acrylamides initiated by radical C–C bond cleavage of the tertiary cycloalkanols
作者:Li-Na Guo、Zhi-Qiang Deng、Yong Wu、Jie Hu
DOI:10.1039/c6ra03431d
日期:——
An efficient Na2S2O8-promoted radical cyclization reaction of acrylamides with the tertiary cycloalkanols has been developed. This one pot procedure involves a tandem C–C bond cleavage and two C–C bonds formation process. The key advantages of this protocol are its transition-metal free, its operational simplicity and its excellent functional group tolerance, thus allowing a facile access to oxindoles
已经开发了有效的Na 2 S 2 O 8促进的丙烯酰胺与叔环烷醇的自由基环化反应。此一锅法涉及串联的C–C键断裂和两个C–C键形成过程。该协议的主要优点是无过渡金属,操作简单和出色的官能团耐受性,因此可以轻松获得含羰基的羟吲哚。
Rh-Catalyzed cascade C–H activation/C–C cleavage/cyclization of carboxylic acids with cyclopropanols
作者:Siqi Wang、Erfei Miao、Hao Wang、Bichao Song、Wei Huang、Weibo Yang
DOI:10.1039/d1cc01778k
日期:——
Merging both C–H and C–C activation in a tandemprocess is a marked challenge. A novel Rh(III)-catalyzed C–H activation/ring opening C–C cleavage/cyclization of carboxylic acids with cyclopropanols was developed for the synthesis of 3-substituted phthalides and α,β-butenolides. This reaction displays excellent functional group tolerance with respect to both carboxylic acids and cyclopropanols and features
The alkoxylradical is an important reactive intermediate in mechanistic studies and organic synthesis; however, its current generation fromalcohol oxidation heavily relies on transition metal activation under strong oxidative conditions. Here we report the first visible-light-induced alcohol oxidation to generate alkoxylradicals by cyclic iodine(III) reagent catalysis under mild reaction conditions