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Chiral 3-methyl-heptanoic acid is readily accessible by functional group manipulation of optically active citronellol. In principle, this approach is general and could be applied to the synthesis of chiral 3-methyl-alkanoic acids seven carbon atoms in length and longer.
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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