Telluronium ylides, addition reactions

The synthesis of aziridines from imines and sulfur ylides has been reviewed in previous editions of PHC and is a well-known reaction. A current study reveals that telluronium ylides add to a,p-unsaturated imines through a Michael addition-elimination to the olefin followed by a second equivalent of telluronium ylide addition to the imine, which subsequently eliminates to form aziridines 137 and 138 in a ratio of 13 1 <05JA12222>. 

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