Cu-mediated or metal-free alkylation of gem-dibromoalkenes with tertiary, secondary and primary alkyl Grignard reagents
作者:Yupian Deng、Xuxue Zhang、Chuan Liu、Song Cao
DOI:10.1016/j.tet.2020.131804
日期:2021.2
A novel copper-mediated or transition-metal-free alkylation of gem-dibromoalkenes with tertiary, secondary and primary alkylGrignardreagents was described. The outcomes of these reactions were found to be highly dependent on the reaction conditions and the type of Grignardreagents used. Specifically, the tertiary alkylation of gem-dibromoalkenes proceeded efficiently in the presence of 50 mol% CuCN
Synthesis of Vinylgermanes via the Au/TiO<sub>2</sub>-Catalyzed <i>cis</i>-1,2-Digermylation of Alkynes and the Regioselective Hydrogermylation of Allenes
作者:Anastasia Louka、Manolis Stratakis
DOI:10.1021/acs.orglett.1c00997
日期:2021.5.7
In the presence of Au/TiO2 (1 mol %), terminal alkynes react quantitatively with stoichiometric amounts of the unactivated digermane Me3Ge-GeMe3, forming exclusively cis-1,2-digermylated alkenes. We also establish the Au/TiO2-catalyzed hydrogermylation of terminal allenes with Et3GeH, which exhibits a highlyregioselective mode of addition on the more substituted double bond forming vinylgermanes.
在Au / TiO 2(1 mol%)的存在下,末端炔烃与化学计量的未活化的Digermane Me 3 Ge-GeMe 3进行定量反应,仅形成顺式-1,2-二聚二甲基化的烯烃。我们还建立了用Et 3 GeH的Au / TiO 2催化的末端烯丙基加氢麦芽酰化反应,该化合物在形成更多取代的双键的乙烯基锗烷上表现出高度的区域选择性加成模式。此外,我们提供了有关Pd纳米颗粒催化的1,2-二聚二甲基烯烃与碘代芳烃的CC偶联的初步结果。
Funasaka et al., Yuki Gosei Kagaku Kyokaishi, 1959, vol. 17, p. 717,720