Eight new monoterpenoid indole and quinoline alkaloids, scholarisines H-O (1-8), together with six known analogues, were isolated from seven-year stored leaves of Alstonia scholaris. Their structures were elucidated on the basis of comprehensive spectroscopic data and X-ray diffraction. The obtained compounds were presumably derived from the known precursors by mild oxidation during the post-harvest storage. (C) 2014 Elsevier Ltd. All rights reserved.
National Natural Science Foundation of China [81225024, 31170334]
; Ministry of Science and Technology of the People's Republic of China [2014ZX09301307-003, 2013BAI11B02]
; Chinese Academy of Sciences [KSZD-EW-Z-004-03]