Sesquiterpenes and alkaloids from Lindera chunii and their inhibitory activities against HIV-1 integrase

Abstract

Three new eudesmane type sesquiterpenoid lindenanolides E (1), F (2) and G (3), and two new aporphine alkaloid lindechunines A (18) and B (20) were isolated from roots of Lindera chunii MERR., together with seven known sesquiterpenes including a new naturally-occurring lindenanolide H (4) and eight known aporphine alkaloids. The structures of these compounds were determined by spectroscopic means. Of the isolated compounds, hernandonine (14), laurolistine (16), 7-oxohernangerine (17) and lindechunine A (18) showed significant antihuman immunodeficiency virus type 1 (HIV-1) integrase activity with IC 50 values of 16.3, 7.7, 18.2 and 21.1 μM, respectively. The major alkaloids presented in the roots of L. chunii were quantitatively analyzed by an HPLC method. © 2002 Pharmaceutical Society of Japan.