Abstract
A series of pyrrole- and indole-fused trifluoromethyl-functionalized piperazine derivatives were constructed in moderate to good yields with excellent chemoselectivities via a Pictet-Spengler reaction under mild and operationally simple conditions. The synthetic utility of this protocol was further extended by the facile preparation of indole-fused CF3-1,4-diazocane and enantioenriched CF3-piperazines via a vinylogous Pictet-Spengler reaction and an asymmetric Pictet-Spengler reaction, respectively.
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