Aryl Pyrazoles from Photocatalytic Cycloadditions of Arenediazonium
作者:Luana Cardinale、Michael Neumeier、Michal Majek、Axel Jacobi von Wangelin
DOI:10.1021/acs.orglett.0c02514
日期:2020.9.18
conditions (rt, 20 min) with catalytic [Ru(bpy)3]2+ under blue-light irradiation and exhibited compatibility with several functional groups (e.g., I, SF5, SO2NH2, N3, CN) and perfect levels of regiocontrol. Mechanistic studies (luminescence spectroscopy, CV, DFT, radical trapping, quantum yield determination) documented an initial oxidative quenching of the excited photocatalyst and the operation of
Ni-Catalyzed β-Alkylation of Cyclopropanol-Derived Homoenolates
作者:L. Reginald Mills、Cuihan Zhou、Emily Fung、Sophie A. L. Rousseaux
DOI:10.1021/acs.orglett.9b03435
日期:2019.11.1
Metalhomoenolates are valuable synthetic intermediates which provide access to β-functionalized ketones. In this report, we disclose a Ni-catalyzed β-alkylation reaction of cyclopropanol-derived homoenolates using redox-active N-hydroxyphthalimide (NHPI) esters as the alkylating reagents. The reaction is compatible with 1°, 2°, and 3° NHPI esters. Mechanistic studies imply radical activation of the
Unconventional type of allylation reaction at the β-position of ketone carbonyl has been developed based on the β-metallo ketone strategy: treatment of siloxycyclopropanes 1 with allylic chlorides 2 in the presence of silver fluoride results in the effective formation of δ, ε-unsaturated ketones 4.
Sequential Ring Opening/In Situ SO2-Capture/Alkynylation of Cyclopropanols with Alkynyl Triflones Initiated by Energy Transfer
作者:Guohua Fan、Changfu Wu、Xiaozu Liu、Peijun Liu
DOI:10.1021/acs.joc.4c00341
日期:2024.6.7
A visible-light-triggered ringopening/in situ SO2-capture/alkynylation sequence of cyclopropyl alcohols with alkynyl triflones using 4CzIPN as a triplet energy transfer photocatalyst is herein described. This metal-free protocol provides a straightforward and atom-economical approach to alkynyl-substituted γ-keto sulfones with a broad scope of substituents. In this transformation, alkynyl triflones