Preparative Organic Chemistry
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ChemInform Abstract: Neighboring Effect of Pyrazole Rings: Regio- and Stereoselective Wagner—Meerwein Rearrangement in Electrophilic Addition Reactions of Norbornadiene-Fused Pyrazoles.
First published: 31 May 2010
Abstract
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ChemInform Abstract
Fused pyrazoles (I) and (VII) undergo electrophilic addition of sulfenyl chloride (II) or bromine to afford skeletally rearranged adducts in a regio- and stereoselective manner which is attributable to the neighboring group participation of the pyrazole ring accompanied by the regioselective formation of a bridged pyrazolium ion.
