A convergent route to structures with multiple contiguous carbon–nitrogen bonds. The divergent role of N -acyl groups

Abstract : The radical addition of xanthates to N,N-diacetyl imidazol-2-one can be followed by a second addition to N,N-di-Boc imidazol-2-one to give after reductive dexanthylation a protected tetra-amine possessing four contiguous carbon–nitrogen bonds, or even five if the starting xanthate itself bears a protected amine. The success of this sequence hinges on the difference in radical stability between radicals substituted by an N-acyl and N-carbamoyl nitrogens, which allows control of the radical addition and prevents the formation of oligomers.
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Songzhe Han, Samir Zard. A convergent route to structures with multiple contiguous carbon–nitrogen bonds. The divergent role of N -acyl groups. Tetrahedron, Elsevier, 2016, 72 (48), pp.7859-7865. ⟨https://www.sciencedirect.com/science/article/pii/S0040402016305026⟩. ⟨10.1016/j.tet.2016.05.085⟩. ⟨hal-02091720⟩

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