CHEMICAL CONSTITUENTS OF THE ROOTS OF Erythrina subumbrans

摘要

In our continuous interest in the constituents of Erythrina subumbrans Merr. (Leguminosae) [1–3], we chose its roots for the first time for phytochemical investigation. In this paper, we report the isolation of 22 compounds, among which are nine pterocarpans: orientanol B (1) [4], phaseollin (2) [5], erythrabyssin II (3) [4], phaseollidin (4) [6], erycristagallin (5) [7], erystagallin A (6) [8], eryvarin D (7) [9], erythrabyssin A (8) [10], and erythrabissin I (9) [6]; three isoflavones: scandenone (10) [11], bidwillon C (11) [12], and wighteone (12) [13, 14]; two 2-arylbenzofurans: bidwillol B (13) [12] and eryvarin L (14) [15]; two steroids: a mixture of β-sitosterol (15) and stigmasterol (16) [16]; two triterpenes: sophoradiol (17) [17, 18] and soyasapogenol B (18) [18–20]; one coumestan: sigmoidin K (19) [21]; one chromen-4-one: eryvarin X (20) [22]; one chalcone: isobavachalcone (21) [23]; and coniferaldehyde (22) [24]. These compounds were identified by comparison of their physical and spectroscopic data with reported data. Compounds 1, 4, 7, 8, 11–14, and 19–22 were found for the first time in this species.