Synthesis of 2,3,6,7-tetrahydro- and 2,3,4,5,6,7-hexahydro-1H-1,4-diazepines via a tandem Michael-type addition–intramolecular aza-Wittig sequence
Aziza Benalil, Andrea Guerin, Bertrand Carboni and Michel Vaultier
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http://dx.doi.org/10.1039/P19930001061