A short total synthesis of the indolopyridine alkaloids angustine (1) and angustoline (2) has been achieved in five and six steps, respectively. Two key steps for assembly of the pentacyclic core included a Bischler-Napieralski cyclization and a cobalt-catalyzed carbonylative lactamization. A late-stage Mukaiyama hydration allowed the first successful transformation of angustine (1) to angustoline (2). (C) 2020 Published by Elsevier Ltd.
Anti-Inflammatory and Anti-Allergy Extracts from Nettle
申请人:Alberte Randall S.
公开号:US20100009927A1
公开(公告)日:2010-01-14
The present invention relates in part to nettle extracts that are useful for treating or preventing seasonal allergies, allergic rhinitis, and other inflammatory conditions.
A short total synthesis of the indolopyridine alkaloids angustine (1) and angustoline (2) has been achieved in five and six steps, respectively. Two key steps for assembly of the pentacyclic core included a Bischler-Napieralski cyclization and a cobalt-catalyzed carbonylative lactamization. A late-stage Mukaiyama hydration allowed the first successful transformation of angustine (1) to angustoline (2). (C) 2020 Published by Elsevier Ltd.
Nine newindolealkaloids, vinmajines A–I (1–9), and 43 known indolealkaloids were isolated from cultivated Vincamajor in Kunming. The new structures were elucidated by extensive spectroscopic and quantum theory analysis. In addition, the results also supported that types of indolealkaloids from V. major might be influenced significantly by the ecological environment.