Visible light-mediated metal-free double bond deuteration of substituted phenylalkenes
作者:Roman Iakovenko、Jan Hlaváč
DOI:10.1039/d0gc03081c
日期:——
Photoactivated metal free deuteration of a double bond was developed in an environmentally friendly manner.
双键的光活化金属无氘化反应以环境友好的方式进行了开发。
A new reduction system: combination of sodium sulfide (sodium hydrosulfide) with phase transfer agent in a two-phase mixture. Reductive debromination ofvic-dibromides to olefins
作者:Juzo Nakayama、Haruki Machida、Masamatsu Hoshino
DOI:10.1016/s0040-4039(00)88080-6
日期:1983.1
A wide variety ofvic-dibromides are debrominated to the corresponding olefins in good to excellent yields are aqueous sodium sulfide or sodium hydrosulfide using tricotylmethylammon chloride as the phase transfer agent in a two-phase mixture.
Iridium‐Catalyzed Hydrochlorination and Hydrobromination of Alkynes by Shuttle Catalysis
作者:Peng Yu、Alessandro Bismuto、Bill Morandi
DOI:10.1002/anie.201912803
日期:2020.2.10
Described herein are two different methods for the synthesis of vinyl halides by a shuttle catalysis based iridium-catalyzed transfer hydrohalogenation of unactivated alkynes. The use of 4-chlorobutan-2-one or tert-butyl halide as donors of hydrogen halides allows this transformation in the absence of corrosive reagents, such as hydrogen halides or acid chlorides, thus largely improving the functional-group
Regioselective Synthesis of α-Functional Stilbenes via Precise Control of Rapid <i>cis</i>–<i>trans</i> Isomerization in Flow
作者:Hyune-Jea Lee、Yuya Yonekura、Nayoung Kim、Jun-ichi Yoshida、Heejin Kim
DOI:10.1021/acs.orglett.1c00538
日期:2021.4.16
The rapid cis–trans isomerization of α-anionic stilbene was regioselectively controlled by using flow microreactors, and its reaction with various electrophiles was conducted. The reaction time was precisely controlled within milliseconds to seconds at −50 °C to selectively give the cis- or trans-isomer in high yields. This synthetic method in flow was well-applied to synthesize precursors of commercial
A Chlorinating Reagent Yields Vinyl Chlorides with High Regioselectivity under Heterogeneous Gold Catalysis
作者:Shengzong Liang、Rene Ebule、Gerald B. Hammond、Bo Xu
DOI:10.1021/acs.orglett.7b02101
日期:2017.9.1
A novel chlorinatingreagent with a high concentration of HCl has enabled the highly regioselective hydrochlorination of unactivated alkynes using a commercial nanogold catalyst. No overchlorination or hydration products were formed, and various functional groups were tolerated. This hydrochlorination method could be conducted under open air.