Transannular Cyclization in Cyclohexanes by Michael Addition of an Amine onto an α,β-Unsaturated Ester: Synthesis of 8-Benzyl-8-azatricyclo3,7>nonane-7-acetic Acid Ethyl Ester and 7-Benzyl-7-azabicycloheptane-1-acetic Acid Ethyl Ester

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