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[摘要]：Four new 9,10-secocycloartane (=9,19-cyclo-9,10-secolanostane) triterpenoidal saponins, named huangqiyenins GJ (14, resp.), were isolated from Astragalus membranaceus Bunge leaves. The acid hydrolysis of 14 with 1M aqueous HCl yielded D-glucose, which was identified by GC analysis after treatment with L-cysteine methyl ester hydrochloride. The structures of 14 were established by detailed spectroscopic analysis as (3 beta,6a,10a,16 beta,24E)-3,6-bis(acetyloxy)-10,16-dihydroxy-12-oxo-9,19-cyclo-9,10-secolanosta-9(11),24-dien-26-yl beta-D-glucopyranoside (1), (3 beta,6a,10a,24E)-3,6-bis(acetyloxy)-10-hydroxy-12,16-dioxo-9,19-cyclo-9,10-secolanosta-9(11),24-dien-26-yl beta-D-glucopyranoside (2), (3 beta,6a,9a,10a,16 beta,24E)-3,6-bis(acetyloxy)-9,10,16-trihydroxy-9,19-cyclo-9,10-secolanosta-11,24-dien-26-yl beta-D-glucopyranoside (3), and (3 beta,6a,10a,24E)-3,6-bis(acetyloxy)-10-hydroxy-16-oxo-9,19-cyclo-9,10-secolanosta-9(11),24-dien-26-yl beta-D-glucopyranoside (4). |
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