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.
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
Palladium‐Catalyzed Regio‐ and Stereoselective Sulfonylation of Aryl Propiolates with Sulfonyl Hydrazides: Access to (
<i>E</i>
)‐
<i>β</i>
‐Aryl Sulfonyl Acrylates
An efficient method for the synthesis of (E)‐β‐arylsulfonylacrylates has been reported. This palladium‐catalyzed approach showed excellent regio‐ and stereoselectivity in the sulfonylation of arylpropiolates with sulfonylhydrazides. Through this approach, a wide range of (E)‐β‐arylsulfonylacrylates were obtained in moderate to high yields.