Structures and Absolute Configurations of Three 7,8-Secolabdane Diterpenes from the Chinese Liverwort Pallavicinia ambigua

✍ Scribed by Zi-Jing Li; Hong-Xiang Lou; Wen-Tao Yu; Pei-Hong Fan; Dong-Mei Ren; Bin Ma; Mei Ji

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: German
• Weight: 87 KB
• Volume: 88
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.200590204

✦ Synopsis

Abstract

The known 7,8‐secolabdane type diterpenoids neopallavicinin (1), pallavicinin (2), and 18‐hydroxypallavicinin (3) were isolated from Pallavicinia ambigua, and their structures were determined. The X‐ray crystal structure of 1 was solved, and, in combination with CD and NMR studies, the absolute configurations of 1–3 were established. A possible biogenetic pathway for 1 and 2 from a single labdane precursor is proposed.