Homoisoflavonoids and Related Compounds. II. Isolation and Absolute Configurations of 3,4-Dihydroxylated Homoisoflavans and Brazilins from Caesalpinia sappan L.(Organic,Chemical)
Three new phenolic compounds, 3'-O-methylsappanol, 3'-O-methylepisappanol and 3'-O-methylbrazilin, were isolated from Sappan Lignum, the dried heartwood of Caesalpinia sappan. The absolute configurations of sappanol, episappanol, 3'-deoxysappanol, 3'-O-methylsappanol, 3'-O-methylepisappanol, brazilin and 3'-O-methylbrazilin were determined by means of Horeau's partial resolution method and chemical correlations. Sappanol, episappanol, 3'-deoxysappanol, 3'-O-methylsappanol and 3'-O-methylepisappanol form a novel class of homoisoflavonoids.
- Chem. Pharm. Bull.
Chem. Pharm. Bull. 35, 2761-2773, 1987