已开发出使用 SF 5 Cl 的铜催化 1,3-烯炔区域发散型氯五氟磺酰化策略。区域选择性由 1,3-烯炔的结构和取代模式决定,从而能够轻松获得三类含 SF 5的产品:炔丙基氯、1,3-二烯和丙二烯。反应系统涉及自由基物质,其中氯原子从 SF 5 Cl 转移到碳自由基被认为是主要途径。通过简单的官能团转换可以合成不同类型的 SF 5 - 结构单元。
Preparation of Chiral Allenes through Pd-Catalyzed Intermolecular Hydroamination of Conjugated Enynes: Enantioselective Synthesis Enabled by Catalyst Design
作者:Nathan J. Adamson、Haleh Jeddi、Steven J. Malcolmson
DOI:10.1021/jacs.9b02637
日期:2019.5.29
surrogate to afford primary amines in a two-step/one-pot process. Examination of chiral catalysts revealed a high degree of reversibility in the C-N bond formation that negatively impacted enantioselectivity. Consequently, an electron-poor ferrocenyl-PHOX ligand was developed to enable efficient and enantioselective enyne hydroamination.
Switch in Selectivity for Formal Hydroalkylation of 1,3‐Dienes and Enynes with Simple Hydrazones
作者:Leiyang Lv、Lin Yu、Zihang Qiu、Chao‐Jun Li
DOI:10.1002/anie.201915875
日期:2020.4.16
anti-Markovnikov addition is obtained by changing to a ruthenium catalyst, thus providing direct and efficient access to homoallylic products exclusively. Isotopic substitution experiments indicate that no reversible hydro-metallation across the metal-π-allyl system occurred under ruthenium catalysis. Moreover, this protocol is applicable to the regiospecific hydroalkylation of the distal C=C bond of 1,3-enynes
Regioselective Access to 3‐Ethylideneflavanones via Rhodium(I)‐Catalyzed 1,3‐Enyne Hydroacylation/Annulation Cascades
作者:Zhi‐Xin Chang、Fu‐Rong Li、Chengcai Xia、Fei Li、Hong‐Shuang Li
DOI:10.1002/adsc.202001565
日期:2021.3.16
The highly efficient synthesis of 3‐ethylideneflavanones throughsequential rhodium(I)‐catalyzed hydroacylation of terminal aryl‐substituted 1,3‐enynes with chelating aldehydes and annulation is described. This straightforward protocol highlights an unprecedented C3‐regioselective hydroacylation of 1,3‐enynes, excellent functional group compatibility, and complete atom economy.
Copper-Catalyzed Radical Bis(trifluoromethylation) of Alkynes and 1,3-Enynes
作者:Haigen Shen、Hawen Xiao、Lin Zhu、Chaozhong Li
DOI:10.1055/s-0039-1690187
日期:2020.1
The copper-catalyzed radical bis(trifluoromethylation) of alkynes and 1,3-enynes is described. With Cu(CH3CN)4BF4 as the catalyst, the reaction of arylalkynes with Togni reagent II and (bpy)Zn(CF3)2at roomtemperature affords the corresponding 1,2-bis(trifluoromethylated) alkenes in good yields with excellent E-stereoselectivity. Under similar conditions, the reaction of 1,3-enynes provides the corresponding
Stereodivergent Synthesis of Tertiary Fluoride-Tethered Allenes via Copper and Palladium Dual Catalysis
作者:Shao-Qian Yang、Yi-Fan Wang、Wei-Cheng Zhao、Guo-Qiang Lin、Zhi-Tao He
DOI:10.1021/jacs.1c03157
日期:2021.5.19
protocol for the unprecedented stereodivergentsynthesis of tertiary fluoride-tethered allenes bearing a stereogenic center and stereogenic axis via Cu/Pdsynergisticcatalysis. A broad scope of conjugated enynes are coupled with various α-fluoroesters in high yields with high diastereoselectivities and generally >99% ee. In addition, the four stereoisomers of the allene products ensure precise access