Tannins and Related Compounds. XX. Two New Ellagitannins Containing a Proto-quercitol Core from Quercus stenophylla MAKINO. (4)

Abstract

A new class of ellagitannins (1 and 2) possessing a proto-quercitol moiety has been isolated from the bark of Quercus stenophylla MAKINO (Fagaceae), and their structures have been characterized from the chemical and spectroscopic evidence as 1, 5-di-O-galloyl-3, 4-(S)-hexahydroxydiphenoyl proto-quercitol (1) and 5-O-galloyl-3, 4-(S)-hexahydroxydiphenoyl protoquercitol (2).