Stereospecific preparation of monoglucosides of optically active trans-1,2- cyclohexanediols by enzymic trans-d-glucosylation, and 13C-N.M.R. Spectroscopy of the resulting mono-d-glucopyranosides
Enantioselective glucosylation of (±)-secondary alcohols with plant glucosyltransferases
摘要:
Two glucosyltransferases were isolated from plant cell cultures of Catharanthus roseus and Nicotiana tabacum. The enzyme from C roseus enantioselectively glucosylated (+/-)-secondary alcohols to give the glucosides of (R)-alcohols, while the glucosylation with that from N. tabacum gave preferentially the glucosides of (S)-alcohols. (C) 2004 Elsevier Ltd. All rights reserved.
Phenolic Glycosides from the Twigs of <i>Salix glandulosa</i>
作者:Chung Sub Kim、Oh Wook Kwon、Sun Yeou Kim、Sang Un Choi、Jae Yoon Kim、Ji Young Han、Soo Im Choi、Jong Gil Choi、Ki Hyun Kim、Kang Ro Lee
DOI:10.1021/np500488v
日期:2014.8.22
As a part of an ongoing search for bioactive constituents from Korean medicinal plants, the phytochemical investigations of the twigs of Salix glandulosa afforded 12 new phenolicglycosides (1–12) and a known analogue (13). The structures of 1–13 were characterized by a combination of NMR methods (1H and 13C NMR, 1H–1H COSY, HMQC, and HMBC), chemical hydrolysis, and GC/MS. The absolute configuration