Sinka V, Fernández I, Padrón JI. Synthesis of Tetrahydroazepines through Silyl Aza-Prins Cyclization Mediated by Iron(III) Salts.
J Org Chem 2022;
87:11735-11742. [PMID:
35977416 PMCID:
PMC9442639 DOI:
10.1021/acs.joc.2c01396]
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Abstract
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A new methodology for the synthesis of seven-membered
unsaturated
azacycles (tetrahydroazepines) was developed. It is based on the powerful
aza-Prins cyclization in combination with the Peterson-type elimination
reaction. In a single reaction step, a C–N, C–C bond
and an endocyclic double bond are formed. Under mild reaction conditions
and using iron(III) salts as sustainable catalysts, tetrahydroazepines
with different degrees of substitution are obtained directly and efficiently.
DFT calculations supported the proposed mechanism.
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