Abstract
Benzylic azomethine ylides (y) generated by deprotonation of the corresponding tertiary amine N-oxides (1a, 1b, 4) react intramolecularly with the suitably positioned unactivated double bond to yield ther corresponding fused membered pyrrolidines (2a, 2b, 5). A competitive evolution of the ylide is obseerved at low temperature leading to the corresponding head to head piperazines (3, 6, 8)
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