|
1
|
Zhan G, Zhang F, Yang K, Yang T, Zhou R, Ma X, Wang N, Guo Z. Polycyclic pyrroloindoline-containing natural products with a unique 3-heptyl-2a,4a-diazapentaleno[1,6- ab]indene core isolated from Alstonia scholaris. Org Biomol Chem 2024; 22:296-301. [PMID: 38054263 DOI: 10.1039/d3ob01637d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Alscholarine C (1), featuring an unprecedented pyrroloindoline-containing natural product (PiNP) with a 6/5/5/5 tetracyclic carbon skeleton, and four known PiNPs (2-5), namely demethylalstoscholarinine E (2), Nb-demethylechitamine (3), winphylline A (4), and echitamine (5), were isolated from Alstonia scholaris. Compound 1 was characterized by a hexahydropyrrolo[2,3-b] indole (HPI) core fused to a unique 4-heptylimidazolidine motif, forming an unparalleled 3-heptyl-2a,4a-diazapentaleno[1,6-ab]indene ring system. Their structures were established by spectroscopic analysis, quantum-chemical calculated 13C NMR data with DP4+ probability analyses, and ECD calculations and comparison. A plausible biosynthetic pathway of 1 was proposed. Compound 1 exhibited potential anti-inflammatory activity against LPS-stimulated NO production in RAW264.7 cells.
Collapse
Affiliation(s)
- Guanqun Zhan
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, P.R. China.
| | - Fuxin Zhang
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, P.R. China.
| | - Kailing Yang
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, P.R. China.
| | - Tao Yang
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, P.R. China.
| | - Ruixi Zhou
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, P.R. China.
| | - Xueqing Ma
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, P.R. China.
| | - Nan Wang
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, P.R. China.
| | - Zengjun Guo
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, P.R. China.
| |
Collapse
|
|
2
|
Hill RA, Sutherland A. Hot off the Press. Nat Prod Rep 2023; 40:1816-1821. [PMID: 38047462 DOI: 10.1039/d3np90052e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
A personal selection of 32 recent papers is presented covering various aspects of current developments in bioorganic chemistry and novel natural products such as alscholarine A from Alstonia scholaris.
Collapse
Affiliation(s)
- Robert A Hill
- School of Chemistry, Glasgow University, Glasgow, G12 8QQ, UK.
| | | |
Collapse
|