Trichloroacetonitrile as a Source of Positive Chlorine Ion for Trapping Huisgen's Zwitterions

[摘要]：The zwitterionic 1 : 1 intermediates generated by addition of N-heterocycles to activated acetylenes are trapped by trichloroacetonitrile to afford 1,2- or 1,4-disubstituted N-heterocycles in moderate to good yields under mild reaction conditions.

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