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
Iron-Catalyzed Ring-Opening Reactions of Cyclopropanols with Alkenes and TBHP: Synthesis of 5-Oxo Peroxides
作者:Chenhao Lou、Xin Wang、Leiyang Lv、Zhiping Li
DOI:10.1021/acs.orglett.1c02824
日期:2021.10.1
rarely used in multicomponent reactions. Herein we report the three-component reaction of cyclopropanols with alkenes and tert-butyl hydroperoxide (TBHP) catalyzed by an iron catalyst. This protocol enables the incorporation of both the β-carbonyl fragment and a peroxy unit across the C═C double bond regioselectively, thus allowing an efficient, facile access to 5-oxo peroxides. Modification of the biologically
noncyclic hypervalent iodine nitrooxylating reagent is prepared from aryliodine diacetate and HNO3. This reagent facilitates the zinc-catalyzed regioselective nitrooxylation of cyclopropylsilylethers with broad scope, and also can be used in the nitrooxylation of various enolizable C−H bonds.
practical nickel-catalyzed deaminative alkylation of Katritzky salts with cyclopropyl alcohols via merging C–N and C–C bond activation. This protocol enables the formation of an alkyl–alkyl bond along with the generation of a versatile ketone functional group in a single operation, thus providing a convenient approach for accessing β-alkyl ketones. This reaction is distinguished by its high functional
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