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A novel amino acid dimer 9a was isolated while trying to apply a known reduction/nucleophilic addition sequence. This dimer provided information both on the mechanism of the process and on the dependence of the desired reaction on the stoichiometry of reagents.
A synthesis of an optically active octahydro-2H-pyrido[1,2-a]pyrazine is presented. The key sequence involved the equilibration of an optically active cis-aldehyde to give the thermodynamic transaldehyde that was trapped by nitromethane anion.
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