Abstract
A new synthesis of the olfactorally active stereoisomers of the musk odorant Galaxolide® is reported. The key step is the ruthenium-catalysed asymmetric hydrogenation of an α-aryl acrylic acid: asymmetric inductions up to 89% have been achieved using a catalytic system prepared in situ by mixing [Ru(benzene)Cl 2] 2 with ( S)-BINAP.
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