Studies on Nepalese Crude Drugs. XXI. On the Diterpenoid Constituents of the Aerial Part of Scutellaria discolor COLEBR.
作者:Akiko OHNO、Haruhisa KIZU、Tsuyoshi TOMIMORI
DOI:10.1248/cpb.44.1540
日期:——
From the aerial part of Scutellaria discolor, eight new neoclerodane diterpenes (compounds 3, 4, 6, 8, 9, 10, 11 and 12) were isolated together with clerodin, dihydroclerodin-I, clerodin hemiacetal (14-hydro-15β-hydroxyclerodin), jodrellin A, scutaltisin, squalene, 24-methylenecycloartanol and a mixture of 3-epioleanolic acid and 3-epiursolic acid. The structures of new compounds were determined by spectroscopic and chemical methods as follows : 3, 15β-ethoxy-14-hydroclerodin; 4, 15α-ethoxy-14-hydroclerodin; 6, (6α)-19-O-acetyl-4, 18 : 11, 16 : 15, 16-triepoxyneoclerodane-6, 15, 19-triol (6-O-deacetyl-14-hydro-15-hydroxyclerodin); 8, 6α-O-acetyl-2, 19 : 4, 18 : 11, 16 : 15, 16-tetraepoxy-14-neoclerodene-6, 19-diol (19-O-deacetyljodrellin A); 9, 10, 11, and 12, 6α-O-acetyl-15β, 19β-di-O-ethyl-, 6α-O-acetyl-15α, 19β-di-O-ethyl-, 6α-O-acetyl-19β-O-ethyl- and 6α, 19-di-O-acetyl-2, 19 : 4, 18 : 11, 16 : 15, 16-tetraepoxyneoclerodane-6, 15, 19-triol, respectively.
18 : 11, 16 : 从黄芩的空中部分中分离出八种新的新白屈菜二萜(化合物3、4、6、8、9、10、11和12)以及白屈菜素、二氢白屈菜素-I、白屈菜半缩醛(14-羟基-15β-羟基白屈菜素)、jodrellin A、scutaltisin、角鲨烯、24-亚甲基环萜醇和3-表白屈菜酸与3-表熊果酸的混合物。新化合物的结构通过光谱和化学方法测定如下:3、15β-乙氧基-14-羟基白屈菜素;4、15α-乙氧基-14-羟基白屈菜素;6、(6α)-19-O-乙酰基-4、18:11、16:15、16-三环氧新白屈菜烷-6、15、19-三醇(6-O-脱乙酰基-14-羟基-15-羟基白屈菜素);8、6α-O-乙酰基-2、19:4、18: