Klischies, Martina and Zenk, Meinhart H.
Stereochemistry of C-methylation in the biosynthesis of rhododendrin in Alnus and Betula.
In: Phytochemistry, Vol. 17, No. 8: pp. 1281-1284
Using differently labelled precursors, it was established that rhododendrin (3-(4-hydroxyphenyl)-1-methylpropyl-β- -glucopyranoside) is formed through the phenylpropane pathway via p-coumaryl alcohol, dihydro-p-coumaryl alcohol and C-methylation of the γ-C-atom of the C6---C3 unit with methionine supplying the methyl group. It was demonstrated that the pro-(S)-hydrogen atom of dihydro-p-coumaryl alcohol is replaced stereospecifically by the methyl group.