method for constructing 1,4-pyrazoles from arylglycines was developed using the copper-catalyzed sydnone–alkyne cycloaddition reaction. The procedure offers a straightforward and general route to the pyrazole heterocycle through a three-step one-pot procedure.
An immunoassay‐based method was used to screen numerous combinations of dipoles and dipolarophiles for their ability to undergo chemoselective and biocompatible [3+2] cycloaddition reactions. The approach fulfills most of the requirements of the click concept and led to the discovery of a copper‐catalyzed reaction that generates pyrazoles from sydnone and alkyne reagents.
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METHOD FOR PRODUCING PYRAZOLES, NOVEL PYRAZOLES AND APPLICATIONS THEREOF
申请人:COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
公开号:US20150368295A1
公开(公告)日:2015-12-24
A method for preparing a pyrazole of formula (I) in which R,R′ and R″ have different meanings, characterised in that it involves reacting a sydnone of formula (II) in which R and R′ have the meanings already indicated, with an alkyne of formula (III) in which R″ has the meaning already indicated, in the presence of copper, to obtain a pyrazole compound of formula (I) that is then isolated and salified if desired.
High-Throughput-Experimentation has been used to revisit the Cu-catalyzed Sydnone-Alkyne Cycloaddition reaction. The reaction has been improved and a new click-and-release reaction has been discovered.