Tannins and related compounds. LXXXIV. Isolation and characterization of five new hydrolyzable tannins from the bark of Mallotus japonicus.
作者:Reiko SAIJO、Gen-ichiro NONAKA、Itsuo NISHIOKA
DOI:10.1248/cpb.37.2063
日期:——
the isolation of five new hydrolyzable tannins (16-20), together with fourteen known tannins (1-14). On the basis of chemical and spectroscopic evidence, the structures of compounds 16 and 17 were established as 1,2-di-O-galloyl-3,6-(R)-hexahydroxydiphenoyl-beta-D-glucose and 1-O-digalloyl-3,6-(R)-hexahydroxydiphenoyl-beta-D-glucose, respectively, while compounds 18 (mallojaponin) and 19 (mallonin) were
化学分析的Malellerus japonicus(Thunb。)Mueller-Arg树皮。(大戟科)导致分离出五个新的可水解单宁(16-20)以及十四个已知的单宁(1-14)。根据化学和光谱学证据,化合物16和17的结构被确定为1,2-二-O-galloyl-3,6-(R)-六羟基二苯甲酰基-β-D-葡萄糖和1-O-二戊酰基-3,6-(R)-六羟基二苯甲酰基-β-D-葡萄糖,而化合物18(mallojaponin)和19(mallonin)显示为1-O-galloyl-2,4-elaeocarpusinoyl-3,6- (R)-戊烯酰基-bet aD-葡萄糖和1-O-galloyl-2,4-elaeocarpusinoyl-β-D-葡萄糖。化合物20(麦芽苦苷)被表征为具有独特的1,1'-(3,3',4,4'-四羟基)二苯并呋喃二羧基的新型鞣花单宁。另一方面,检查叶片发现存在可水解单宁