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%)
Iron-Catalyzed Ring Opening of Cyclopropanols and Their 1,6-Conjugate Addition to <i>p</i>-Quinone Methides
作者:Baliram B. Mane、Suresh B. Waghmode
DOI:10.1021/acs.joc.1c02059
日期:2021.12.17
A novel iron-catalyzed ringopening of cyclopropanols and their 1,6-conjugate addition to p-quinone methides for accessing substituted phenols is disclosed. In this protocol, various cyclopropanols are converted to alkyl radicals and undergo 1,6-conjugate addition to p-quinone methides toward C–C bond formation. The salient features of this methodology include operationally simple and mild reaction
Silver-Catalyzed Ring-Opening Strategy for the Synthesis of β- and γ-Fluorinated Ketones
作者:Huijun Zhao、Xuefeng Fan、Jiajia Yu、Chen Zhu
DOI:10.1021/jacs.5b00939
日期:2015.3.18
A regioselective synthesis of β- and γ-fluorinated ketones via silver-catalyzed ring opening is described. A variety of β- and γ-fluorinated ketones are efficiently prepared, respectively, from tertiary cyclopropanol and cyclobutanol precursors, providing a straightforward approach for the introduction of a fluorine atom into complex molecules. Preliminary mechanistic studies suggest that a radical-mediated
描述了通过银催化开环的 β- 和 γ-氟化酮的区域选择性合成。各种β-和γ-氟化酮分别由叔环丙醇和环丁醇前体有效制备,为将氟原子引入复杂分子提供了一种直接的方法。初步机理研究表明,涉及自由基介导的连续 CC 键裂解和 CF 键形成途径。
Rhodium(III)-Catalyzed Mild Alkylation of (Hetero)Arenes with Cyclopropanols via C–H Activation and Ring Opening
作者:Xukai Zhou、Songjie Yu、Zisong Qi、Lingheng Kong、Xingwei Li
DOI:10.1021/acs.joc.6b00650
日期:2016.6.3
alkylation of (hetero)arenes using cyclopropanols as a reactive and efficient coupling partner under oxidative conditions has been developed. This coupling occurred at room temperature via C–H activation of arenes and C–C cleavage of cyclopropanols. Various types of (hetero)arenes (indolines, carbazole, tetrahydrocarbazole, pyrrole, thiophene, etc.) were all successfully reacted under the present conditions