Copper-Catalyzed Regio- and Enantioselective Hydroallylation of 1-Trifluoromethylalkenes: Effect of Crown Ether
作者:Yuki Kojima、Masahiro Miura、Koji Hirano
DOI:10.1021/acscatal.1c02947
日期:2021.9.17
A Cu-catalyzedregio- and enantioselective hydroallylation of 1-trifluoromethylalkenes with hydrosilanes and allylic chlorides has been developed. An in situ generated CuH species undergoes the hydrocupration regio- and enantioselectively to form a chiral α-CF3 alkylcopper intermediate, which then leads to the optically active hydroallylated product. The key to success is the use of not only an appropriate
Remote Allylation of Unactivated C(sp<sup>3</sup>)–H Bonds Triggered by Photogenerated Amidyl Radicals
作者:Bin Xu、Uttam K. Tambar
DOI:10.1021/acscatal.9b00563
日期:2019.5.3
The allylationreaction is a highly versatile transformation in chemical synthesis. While many elegant direct C(sp2)–H allylationreactions have been developed, the direct allylation of unactivated C(sp3)–H bonds is underdeveloped. By applying photoredox catalysis and a [1,5]-HAT process, herein we report a direct allylation of unactivated C(sp3)–H bonds. This photocatalyzed transformation is tolerant
Ligand-Enabled Copper-Catalyzed Regio- and Stereoselective Allylboration of 1-Trifluoromethylalkenes
作者:Yuki Kojima、Yuji Nishii、Koji Hirano
DOI:10.1021/acs.orglett.2c03024
日期:2022.10.14
A copper-catalyzed regio- and stereoselectiveallylboration of 1-trifluoromethylalkenes with bis(pinacolato)diboron (pinB–Bpin) and allylic chlorides has been developed to form functionalized trifluoromethylated products with high diastereoselectivity. The key to success is the judicious choice of Cs2CO3 base and t-Bu-modified dppe-type ligand, which enables the otherwise challenging high catalyst
Direct C–H Allylation of Unactivated Alkanes by Cooperative W/Cu Photocatalysis
作者:Pol Martínez-Balart、Balázs L. Tóth、Álvaro Velasco-Rubio、Martín Fañanás-Mastral
DOI:10.1021/acs.orglett.2c02887
日期:2022.9.23
enables the direct allylation of strong aliphatic C–H bonds with simple allylic chlorides. The method relies on a cooperative interaction of two metal catalysts in which the decatungstate anion acts as a hydrogen-atom abstractor generating a nucleophilic carbon-centered radical that engages in an SH2′ reaction with an activated allylic π-olefin–copper complex. Because of this dualcatalysis, the protocol
在这里,我们报告了一种光催化方法,该方法能够用简单的烯丙基氯化物直接烯丙基化强脂肪族 C-H 键。该方法依赖于两种金属催化剂的协同作用,其中十钨酸盐阴离子作为氢原子吸收剂产生亲核碳中心自由基,该自由基与活化的烯丙基π-烯烃-铜络合物发生S H 2' 反应。由于这种双重催化作用,该协议允许在温和条件下在短反应时间内对一系列化学原料和天然产物进行功能化。
OPPOLZER, W.;PITTELOUD, R.;STRAUSS, H. F., J. AMER. CHEM. SOC., 1982, 104, N 23, 6476-6477