Tetranortriterpenoids and related substances. Part 20. New tetranortriterpenoids from the seeds of Chukrasia tabularis(Meliaceae); simple esters of phragmalin and 12α-acetoxyphragmalin

Abstract

Four new tetranortriterpenoids isolated from the light petroleum extract of the seeds of Chukrasia tabularis(Meliaceae) have been identified as the 3,30-di-isobutyrates (1) and (2) and the 3-isobutyrate 30-propionates (3) and (4) of phragmalin and 12α-acetoxyphragmalin. Two compounds (12) and (13) with a modified furan ring were also obtained from the extract.