New Triterpenoids from the Leaves of Abrus Precatorius

Abstract

Three new ( 1-3 ) triterpenoids and one known ( 4 ) triterpenoid were isolated from an acid hydrolyzed methanol-soluble extract of the leaves of Abrus precatorius . Their structures were identified as (20 S ,22 S )-3 g ,22-dihydroxycucurbita-5(10),24-diene-26,29-dioic acid i -lactone ( 1 ), 3- O -[6'-methyl- g - d -glucuronopyranosyl]-3 g ,22 g -dihydroxyolean-12-en-29-oic acid methyl ester ( 2 ), 3- O - g - d -glucuronopyranosylsophoradiol methyl ester ( 3 ), and sophoradiol ( 4 ) by spectroscopic techniques including 2D NMR.