Details

Autor(en) / Beteiligte

• Chen, Shun-Qing
• Jia, Jia
• Hu, Jing-Yao
• Wu, Jun
• Sun, Wen-Ting
• Zheng, Mingxin
• Wang, Xi
• Zhu, Kong-Kai
• Jiang, Cheng-Shi
• Yang, Sheng-Ping
• Zhang, Juan
• Wang, Shou-Bao
• Cai, You-Sheng

Titel

Iboga-type alkaloids with Indolizidino[8,7-b]Indole scaffold and bisindole alkaloids from Tabernaemontana bufalina Lour

Ist Teil von

• Phytochemistry (Oxford), 2022-04, Vol.196, p.113089-113089, Article 113089

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2022

Quelle

MEDLINE

Beschreibungen/Notizen

• Phytochemical investigation on the aerial parts of Tabernaemontana bufalina Lour. (Apocynaceae) led to the identification of four undescribed monoterpenoid indole alkaloids named taberbufamines A−D, an undescribed natural product, and fourteen known indole alkaloids. The structures of the undescribed alkaloids were established by spectroscopic and computational methods, and their absolute configurations were further determined by quantum chemical TDDFT calculations and the experimental ECD spectra. Taberbufamines A and B possessed an uncommon skeleton incorporating an indolizidino [8,7-b]indole motif with a 2-hydroxymethyl-butyl group attached at the pyrrolidine ring. Biosynthetically, Taberbufamines A and B might be derived from iboga-type alkaloid through rearrangement. Vobatensine C showed significant bioactivity against A-549, Bel-7402, and HCT-116 cells with IC50 values of 2.61, 1.19, and 1.74 μM, respectively. Ervahanine A showed antimicrobial activity against Bacillus subtilis, Mycobacterium smegmatis, and Helicobacter pylori with MIC values of 4, 8, and 16 μg/mL, respectively. 19(S)-hydroxyibogamine was shown as butyrylcholinesterase inhibitor (IC50 of 20.06 μM) and α-glycosidase inhibitor (IC50 of 17.18 μM), while tabernamine, ervahanine B, and ervadivaricatine B only showed α-glycosidase inhibitory activities with IC50 values in the range of 0.95–4.61 μM. Taberbufamines A and B possessed an uncommon skeleton incorporating an indolizidino [8,7-b]indole motif with a 2-hydroxymethyl-butyl group attached at the pyrrolidine ring. [Display omitted] •Taberbufamines A and B had a skeleton with an indolizidino [8,7-b]indole motif.•Some alkaloids showed cytotoxicity, antimicrobial and BChE inhibitory activities.•The mechanisms against BChE were tested by Lineweaver-Burk plot analysis.•A plausible biogenetic pathway for taberbufamines A and B was proposed.