Copper-Catalyzed 1,1-Alkylmonofluoroalkylation of Terminal Alkynes with Diazo Compounds and 2-Fluoro-1,3-dicarbonyl Compounds: Access toward (<i>E</i>)-β-Monofluoroalkyl-β,γ-unsaturated Esters or Ketones
作者:Yunhe Lv、Weiya Pu、Xueli Zhu、Chen Chen、Shanshan Wang
DOI:10.1021/acs.joc.1c00789
日期:2021.8.6
An efficient copper-catalyzed three-component 1,1-alkylmonofluoroalkylation of terminal alkynes, diazo compounds, and 2-fluoro-1,3-dicarbonyl compounds for the synthesis of (E)-β-monofluoroalkyl-β,γ-unsaturated esters or ketones has been developed. The methodology features a broad substrate scope, an inexpensive and easily available catalytic system, and excellent selectivity with good yields. The
一种有效的铜催化三组分 1,1-烷基单氟烷基化末端炔烃、重氮化合物和 2-氟-1,3-二羰基化合物,用于合成 ( E )-β-单氟烷基-β,γ-不饱和酯或酮已经被开发出来。该方法具有广泛的底物范围、廉价且易于获得的催化系统以及出色的选择性和良好的产率。已经研究了串联铜催化交叉偶联和丙二烯的亲核加成的机制。
Copper-catalyzed 1,1-arylalkylation of terminal alkynes with diazo esters and organoboronic acids
作者:Yunhe Lv、Weiya Pu、Xueru Liu、Jinye Sun、Mengxing Cui
DOI:10.1039/c9cc07461a
日期:——
A novel copper-catalyzed 1,1-arylalkylation of terminal alkynes with diazo esters and organoboronicacids is described. With this methodology, (E)-β-aryl-β,γ-unsaturated esters can be easily constructed in good to excellent yields directly from readily available and inexpensive traditional coupling reagents.
The CO‐bubbling effect in cycloisomerization reactions of enynesderivedfrommonoterpenes has been studied using PtCl2, [Rh2Cl2(CO)4] and AuCl3 as catalytic systems. All the precursors are efficient catalysts for the cycloisomerization of O‐tethered enynes. The reaction proceeds through exo‐dig and endo‐dig pathways, which are consistent with the exclusive coordination of the alkyne triple bond to