已经发现,在5mol%的碘化亚铜(I)存在下,格氏试剂可将磺酰基活化的sp 3碳-氮键裂解。重要的是,广泛的磺酰基活化的苄基,烯丙基和炔丙基胺与格利雅试剂进行平滑的交叉偶联反应,从而提供结构多样的偶联产物,收率高至优异,并具有较高的化学,区域和立体选择性。此外,已经证明S N 2机理参与交叉偶联反应,该交叉偶联反应允许由旋光的α-支化胺衍生物不对称地合成手性烃。
halosilanes was catalysed by iridiumamidocomplexes to produce hydrosilanes. Selective monohydrogenolysis of di- and trichlorosilanes similarly proceeded, resulting in the formation of chlorohydrosilanes (R2SiHCl or RSiHCl2) as synthetically important building blocks for various organosilicon compounds. A mechanistic study supported the in-situ formation of an iridium hydride species as a key intermediate
An Electroreductive Approach to Radical Silylation via the Activation of Strong Si–Cl Bond
作者:Lingxiang Lu、Juno C. Siu、Yihuan Lai、Song Lin
DOI:10.1021/jacs.0c10899
日期:2020.12.23
In this context, reactions mediated by silyl radicals have become increasingly attractive but methods for accessing these intermediates remain limited. We present a new strategy for silyl radical generation via electroreduction of readily available chlorosilanes. At highly biased potentials, electrochemistry grants access to silyl radicals through energetically uphill reductive cleavage of strong
Formal Hydrotrimethylsilylation of Styrenes with Anti-Markovnikov Selectivity Using Hexamethyldisilane
作者:Xin Wang、Zhi-Xiang Yu、Wen-Bo Liu
DOI:10.1021/acs.orglett.2c03170
日期:2022.12.9
A combination of CsF and hexamethyldisilane in DMSO enabling an anti-Markovnikov formal hydrotrimethylsilylation of styrenes is reported. Mechanistic investigations detail the reaction pathways, including in situ generation of a silyl anion, the addition of this silyl anion onto the alkene to form a carbanion, and this carbanion is then protonated by DMSO. The choice of the solvent to match its reactivity