Synthesis of Pyrido[1,2-<i>b</i>]indazoles via Aryne [3 + 2] Cycloaddition with<i>N</i>-Tosylpyridinium Imides

Abstract

The [3 + 2] cycloaddition of arynes with N-tosylpyridinium imides, followed by an elimination of Ts(-), affords pyrido[1,2-b]indazoles under mild reaction conditions in good yields.