1-Sulfonyl-1,2,3-triazoles, readily prepared from terminal alkynes and sulfonylazides, react with allenes in the presence of a nickel(0) catalyst to produce the corresponding isopyrroles. The initially produced isopyrroles are further converted to a wide range of polysubstituted pyrroles through double bond transposition and Alder-ene reactions.
Selective Formation of 1,5-Substituted Sulfonyl Triazoles Using Acetylides and Sulfonyl Azides
作者:Maria Elena Meza-Aviña、Mudita Kishor Patel、Cylivia B. Lee、Thomas J. Dietz、Mitchell P. Croatt
DOI:10.1021/ol200696q
日期:2011.6.17
with sulfonyl azides was found to selectively form 1,5-substituted sulfonyl triazoles. This reaction thus provides access to the regioisomeric product as compared to the popular copper-catalyzed azide–alkyne cycloaddition. The reaction is efficient and selective with a variety of alkyne sources and sulfonyl azides and can incorporate an additional electrophile to yield 1,4,5-trisubstituted sulfonyl