Tetrahydro-1,3-oxazepines via Intramolecular Amination
of Cyclopropylmethyl Cation
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Abstract
An efficient synthesis of tetrahydro-1,3-oxazepines
was developed
involving the regioselective intramolecular amination of cyclopropylmethyl
cation. The cation was generated by the abstraction of one imidate
group in bis-imidate bearing a carbocation-stabilizing substituent.
Using 1,1,2,3-tetrasubstituted cyclopropane substrates, highly diastereoselective
intramolecular amination to <i>trans</i>-tetrahydro-1,3-oxazepines
was achieved. The resulting tetrahydro-1,3-oxazepines were transformed
to the homoallylamine derivatives in high yields