The disaccharide glycoside, (3R,9R)-3-hydroxy-7,8-dihydro-beta -ionyl 6-O-beta -D-apiofuranosyl-beta -D-glucopyranoside was isolated as an aroma precursor from the leaves of Camellia sinensis var. sinensis cv. Yabukita. Its stereochemistry was elucidated on the basis of spectral data and chemical synthesis. (C) 2001 Elsevier Science Ltd. All rights reserved.
A synthetic study of (−)-dihydroedulan II and related compounds
(−)-Dihydroedulan II and relatedcompounds were synthesized from (2R,1′RS)-dihydro-α-ionol, which was prepared by lipase-catalyzed enantioselective transesterification of the corresponding diastereomeric mixture as the key-step. Fungal allylic oxidation of (−)-dihydroedulan II worked well to afford a corresponding alcohol as well as (+)-dihydroedulan-8-one.