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New alkaloids from Daphniphyllum himalense†
Hua Zhang,Dong-Dong Zhang,Jing-Ya Li,Sajan L. Shyaula,Jia Li,Jian-Min Yue
RSC Advances Pub Date : 04/29/2016 00:00:00 , DOI:10.1039/C6RA06420E
Abstract

Nine new Daphniphyllum alkaloids (1–9) and 16 biosynthetically related known ones were obtained during the phytochemical investigation into a Nepalese plant, Daphniphyllum himalense. Structures were assigned to these compounds based on careful spectroscopic interpretation and NMR comparison with literature data. Deuteration of H2-16 in CD3OD due to quick keto-enol tautomerization was observed for both 2 and 3. The recently reported 3β-hydroxydaphniyunnine A was re-examined and its structure was revised to be 21-deoxymacropodumine D via X-ray diffraction analysis. All the isolates were screened preliminarily for their in vitro inhibitory effects against four kinases, PTP1B, aurora A, HDAC6 and IKK-β, and selective alkaloids exhibited weak activities at 20 μg mL−1.

Graphical abstract: New alkaloids from Daphniphyllum himalense
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