A general and expeditious approach for the copper mediated synthesis of multi‐functionalized dihydropyrazoles from N‐sulfonylhydrazones and sulfoxonium ylides has been achieved under aerobic oxidative conditions. The formal [4+1] cycloaddition reaction exhibits many notable features and can be easily scaled up to gram scale.
Photoredox/cobaloxime co-catalyzed allylation of amines and sulfonyl hydrazines with olefins to access α-allylic amines and allylic sulfones
作者:Hui Xu、Hong Zhang、Qing-Xiao Tong、Jian-Ji Zhong
DOI:10.1039/d1ob01307f
日期:——
reported a dual-catalytic platform for the allylation of amines and sulfonyl hydrazines with olefins to selectively access α-allylic amines and allylic sulfones in good yields by combining photoredox catalysis and cobaloxime catalysis. This strategy avoided the use of a stoichiometric amount of terminal oxidant and the use of pre-functionalized allylic precursors, representing a green and ideal atom- & step-economical
Rhodium-catalyzed addition of sulfonyl hydrazides to allenes: regioselective synthesis of branched allylic sulfones
作者:Vahid Khakyzadeh、Yu-Hsuan Wang、Bernhard Breit
DOI:10.1039/c7cc02375h
日期:——
A rhodium-catalyzed regioselective addition of sulfonyl hydrazides to allenes is reported. With Rh(I)/DPEphos/benzoic acid as the catalyst system, branched allylic sulfones can be obtained, in good to excellent yields and regioselectivities.
A new strategy for the transformation of terminalalkynes to branched allylic sulfones was developed. Using a Rh(I)/DPEphos/benzoic acid catalyst system, terminalalkynes react with sulfonyl hydrazides to produce branched allylic sulfones with good to excellent yields and selectivities in general.
A tunable electrosynthesis of sulfonyl‐ and bromo‐substituted indolo[2,1‐α]isoquinoline derivatives has been disclosed. In this reaction, a variety of easily available 2‐aryl‐N‐acryloyl indoles can readily react with sulfonyl and/or bromine radicals, which are generated from arylsulfonyl hydrazides and potassium bromide respectively, to furnish the valuable sulfonyl‐ and bromo‐substituted benzindolo‐fused