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note
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Experimental procedures of these reactions followed those described in ref 12e. The stereochemical assignments of the products derived from the glycine imine or the piperazine imminium of tropone were made as follows. The stereochemistries of the products derived from the piperazine imminium were assigned by the NOESY method and the exo/endo ratio was determined by integration of the N-methyl protons (δ = 2.28 for the exo isomer and 2.20 for the endo isomer) as well as the bridge head protons (δ = 3.19 for the exo isomer and 3.08 for the endo isomer). The stereochemical assignment of the amine from the glycine inline, obtained as a single isomer, was made by conversion into the corresponding endo-piperazine derivative.
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