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.
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。
Ruthenium-catalyzed room-temperature coupling of α-keto sulfoxonium ylides and cyclopropanols for δ-diketone synthesis
Previous transition metal-catalyzed synthesis processes of δ-diketones are plagued by the high cost of the rhodium catalyst and harsh reaction conditions. Herein a low-cost, roomtemperature ruthenium catalytic method is developed based on the coupling of α-keto sulfoxoniumylides with cyclopropanols. The mild protocol features a broad substrate scope (47 examples) and a high product yield (up to 99%)
Palladium-catalyzed cross-coupling of cyclopropanol-derived ketone homoenolates with aryl bromides
作者:David Rosa、Arturo Orellana
DOI:10.1039/c3cc42080a
日期:——
The cross-coupling reaction of cyclopropanol-derived ketone homoenolates bearing β-hydrogens with aryl and hetaryl bromides has been achieved for the first time. This reaction is high yielding, is broad in scope and uses a simple catalytic system. Notably, the proposed palladium homoenolates do not undergo β-hydride elimination to the corresponding α,β-unsaturated ketones.
Ruthenium-Catalyzed Alkylation of Cyclopropanols with Sulfoxonium Ylides via C–C Bond Cleavage: Formation of Diverse 1,5-Diketones
作者:Mei Guan、Yong Wu、Xin Huang、Jianglian Li、Hua He、Kaichuan Yan、Ruizhi Lai、Yi Luo
DOI:10.1055/a-1588-0974
日期:2022.2
A novel ruthenium-catalyzed alkylation of cyclopropanols with sulfoxonium ylides has been developed that affords diverse 1,5-diketones with good efficiency and broad substrate scope. To illustrate the synthetic applications of the obtained 1,5-diketones, aldol and cyclization reactions have been investigated. Preliminary mechanistic studies suggest that this process involves a sequential C–C activation