Evaporation of the solvent afforded a 95:5 mixture (365 mg, 98% theoretical) of the two isomeric epoxides. A CHC13 solution (50 mL) of this mixture (365 mg) was treated with p-TsOH acid (3 mg) at room temperature for 18 h and worked up as described above. The reaction mixture (350 mg) was chromatographed on a silica gel H column eluted with EtOAc to yield compound 23 (294 mg, 82% theoretical): amorphous material (CHC13); mp
Triterpene der Art (I) werden aus den Blättern der im Titel genannten zur Klasse der Boraginaceen gehörigen Baumart isoliert und strukturell zugeordnet.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.