(±) Erysectin A, a new isoprenylated isoflavone with a rare acetonyl group from Erythrina secundiflora Hassk

An overview of techniques and strategies for isolation of flavonoids from the genus Erythrina

“…The isolated Erythrina flavonoid compounds along with the extraction solvents and isolation and purification techniques are arranged alphabetically according to the names of the compounds in Table S1 [49 -192]. The diversity of this flavonoid framework consists of 25 flavones (1-25), four flavanols (26)(27)(28)(29), 103 flavanones , 16 chalcones (133)(134)(135)(136)(137)(138)(139)(140)(141)(142)(143)(144)(145)(146)(147)(148), 12 isoflavans (149-160), eight isoflav-3-enes (161)(162)(163)(164)(165)(166)(167)(168), 55 isoflavanones , 1011 isoflavones (224-324), 72 pterocarpans, 6αhydroxypterocarpans, and pterocarpenes (325-396), five coumestans (397-401), four 3-arylcoumarins (402-405), one coumaronochromones (406), 20 2-arylbenzofurans and 3-aryl-2,3-dihydrobenzofurans (407-426), and one bioflavonoids (427) (Table 2). Flavonoids have semi-polar to polar properties, which is due to the presence of hydroxyl groups that fail to be substituted.…”

“…Based on the chemical structure of the isolated flavonoids, they can be grouped into 17 groups as shown in Table 2 [3, 5]. The isolated Erythrina flavonoid compounds along with the extraction solvents and isolation and purification techniques are arranged alphabetically according to the names of the compounds in Table S1 [49–192]. The diversity of this flavonoid framework consists of 25 flavones (1–25), four flavanols (26–29), 103 flavanones (30–132), 16 chalcones (133–148), 12 isoflavans (149–160), eight isoflav‐3‐enes (161–168), 55 isoflavanones (169–223), 1011 isoflavones (224–324), 72 pterocarpans, 6α‐hydroxypterocarpans, and pterocarpenes (325–396), five coumestans (397–401), four 3‐arylcoumarins (402‐405), one coumaronochromones (406), 20 2‐arylbenzofurans and 3‐aryl‐2,3‐dihydrobenzofurans (407–426), and one bioflavonoids (427) (Table 2).…”