Synthesis of Diverse Boron-Handled N-Heterocycles via Radical Borylative Cyclization of <i>N</i>-Allylcyanamides
作者:Ji-Kang Jin、Feng-Lian Zhang、Qiang Zhao、Jun-An Lu、Yi-Feng Wang
DOI:10.1021/acs.orglett.8b03303
日期:2018.12.7
A synthetic method based on radical borylation/cyclization cascades of N-allylcyanamides was developed to construct diverse boron-substituted N-heterocycles. In the reaction process, the N-heterocyclic carbene-boryl radical underwent a chemo- and regioselective addition to the alkene moiety, followed by cyclization with the N-cyano group. The resulting amide-iminyl radical intermediates underwent further reactions to afford various boron-tethered N-heterocyclic molecules. Further transformations to access synthetically useful building blocks were also demonstrated.
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