摘要
Three new indole alkaloids, flueindolines A–C(1–3), along with nine known alkaloids(4–12), were isolated from the fruits of Flueggea virosa(Roxb. ex Willd.) Voigt. Compounds 1 and 2 are two new fused tricyclic indole alkaloids possessing an unusual pyrido[1, 2-a]indole framework, and 3 presents a rare spiro(pyrrolizidinyl-oxindole) backbone. Their structures with absolute configurations were elucidated by means of comprehensive spectroscopic analysis, chemical calculation, as well as X-ray crystallography. Chiral resolution and absolute configuration determination of the known compounds 4, 10, and 11 were reported for the first time. The hypothetical biogenetical pathways of 1–3 were herein also proposed.
基金
the National Key R & D Program of China (No. 2018YFC1706200)
the National Natural Science Foundation of China (Nos. 81630095, 81622045, and 81803379)
the Science & Technology Program of China (No.2019ZX09735002-003)
the China Postdoctoral Science Foundation(Nos. 2019T120794, and 2018M633291)
the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (No. 2017BT01Y036)。
