Labile γ-glutamaldehydic acid (1) was first converted to tryptophan via its phenylhydrazone; no racemization occurred during the reaction. The stability of 1 was shown to be remarkably enhanced in the presence of additives.
The mixed solvent of nitromethane and hexane exhibited high stereoselectivity with good yields in the synthesis of ubiquinone-10 by the coupling of 2,3-dimethoxy-5-methylhydroquinone and isodecaprenol in the presence of a catalytic amount of BF3·OEt2.
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