Rhodium Porphyrin Catalyzed Regioselective Transfer Hydrogenolysis of C–C σ-Bonds in Cyclopropanes with <sup><i>i</i></sup>PrOH
作者:Chen Chen、Shiyu Feng、Kin Shing Chan
DOI:10.1021/acs.organomet.9b00290
日期:2019.6.24
porphyrin catalyzed regioselective transfer hydrogenolysis of both activated and unactivated cyclopropanes employing iPrOH as the hydrogen source was discovered. The reaction mechanism for the C–C σ-bond activation of cyclopropanes was identified through an initial radical substitution with rhodium(II) metalloporphyrin radical to give a rhodium porphyrin alkyl, followed by hydrogenolysis with iPrOH to give
作者:Gary. Stufflebeme、Kurt T. Lorenz、Nathan L. Bauld
DOI:10.1021/ja00274a070
日期:1986.7
Cyclopropanation de divers dienes conjugues, styrenes et alcenes riches en electrons en utilisant le diazoacetate d'ethyle et un sel de triarylammoniumyle comme initiateur/catalyseur
Cyclopropanation de divers diene conjugues, 苯乙烯和 alcenes riches en utilisant le diazoacetate d'ethyle et un sel de triarylmigrantyle comme initialur/catalyseur
A transition-metal-free & diazo-free styrene cyclopropanation
作者:Ana G. Herraiz、Marcos G. Suero
DOI:10.1039/c9sc02749a
日期:——
An operationally simple and broadly applicable novel cyclopropanation of styrenes using gem-diiodomethyl carbonyl reagents has been developed. Visible-light triggered the photoinduced generation of iodomethyl carbonyl radicals, able to cyclopropanate a wide array of styrenes with excellent chemoselectivity and functional group tolerance. To highlight the utility of our photocyclopropanation, we demonstrated
Radical Cation Cyclopropanations via Chromium Photooxidative Catalysis
作者:Francisco J. Sarabia、Eric M. Ferreira
DOI:10.1021/acs.orglett.7b01095
日期:2017.6.2
The chromium photocatalyzed cyclopropanation of diazo reagents with electron-rich alkenes is described. The transformation occurs under mild conditions and features specific distinctions from traditional diazo-based cyclopropanations (e.g., avoiding β-hydride elimination, chemoselectivity considerations, etc.). The reaction appears to work most effectively using chromium catalysis, and a number of
Cycloaddition Reactions of Alkene Radical Cations using Iron(III)‐Phenanthroline Complex
作者:Yong Hyun Cho、Jae Hyung Kim、Hyeju An、Kwang‐Hyun Ahn、Eun Joo Kang
DOI:10.1002/adsc.202000191
日期:2020.5.26
oxidation of electron‐rich alkenes using the iron(III)‐phenanthroline complex produced electrophilic alkene radical cations, which promoted efficient radical cation [2+1] cycloaddition reactions with diazo compounds. Subsequent chain propagation afforded tri‐ and tetra‐substituted cyclopropanes. This methodology was also expanded to [3+2] cycloaddition reactions with vinyl diazoesters, validating this sustainable