Synthesis of β-(1→2)-Linked 6-Deoxy-<scp>l</scp>-altropyranose Oligosaccharides via Gold(I)-Catalyzed Glycosylation of an <i>ortho</i>-Hexynylbenzoate Donor
The β-(1→2)-linked 6-deoxy-l-altropyranose di- to pentasaccharides 2–5, relevant to the O-antigen of the infectious Yersinia enterocolitica O:3, were synthesized for the first time. The challenging 1,2-cis-altropyranosyl linkage was assembled effectively via glycosylation with 2-O-benzyl-3,4-di-O-benzoyl-6-deoxy-l-altropyranosyl ortho-hexynylbenzoate (7) under the catalysis of PPh3AuNTf2. NMR and molecular
Abstract From Rhododendron japonicum were isolated two diterpeneglucosides, pieroside B and grayanoside B, and two new triterpenes, 2α,3α,24-trihydroxy
摘要 从日本杜鹃花中分离得到两种二萜糖苷,pieroside B 和grayanoside B,以及两种新的三萜,2α,3α,24-trihydroxy