Telluronium ylides, addition

The related telluronium ylides also add to a,/3-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 654 and 655 in a ratio of 13 1 (Scheme 159) <2005JA12222>. 

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