Chemical conversion of (4S,5S)-(+)-germacrone 4,5-epoxide, a plausible biogenetic intermediate found in the essential oil of Zedoariae rhizoma from Yakushima, Japan.
The biogenetic-type chemical conversion of (4S, 5S)-(+)-germacrone 4, 5-epoxide (2___∼) was examined. It was found that acidic treatment of 2___∼ furnished three guaiane-sesquiterpenoids : GU-1 (3___∼), GU-2 (4___∼), and GU-3 (5___∼), while alkaline treatment of 2___∼ provided an eudesmane-sesquiterpenoid EU-1 (6___∼) as respective major reaction products. The structures of these conversion products were determined on the basis of their spectral data. GU-2 (4___∼) was further analyzed by X-ray crystallography. The GU-1 (3___∼) and GU-2 (4___∼) were found in minor quantities in Zedoariae Rhizoma from Yakushima, Japan. THe previously proposed structure of procurcumenol is revised as 3___∼.
Abstract The transformation of germacrone, a 10-membered ring sesquiterpene, by suspension culturedcells of Lonicera japonica, Bupleurum falcatum, Polygonum tinctorium and solidago altissima , was investigated. Germacrone was converted into several types of sesquiterpenes, such as guaiane, eudesmane and seco-guaiane and their structures were determined from spectral and chemical evidence. The configurations
摘要 研究了金银花、柴胡、何首乌和一枝黄花悬浮培养细胞对10元环倍半萜基麦角酮的转化。Germacrone 被转化为几种类型的倍半萜,如愈创木、eudesmane 和 seco-guaiane,它们的结构由光谱和化学证据确定。一些产品的构型是通过 CD 光谱确定的。讨论了四种悬浮培养细胞在产品种类上的差异。
Structures of sesquiterpenes from Curcuma aromatica Salisb.
作者:MASANORI KUROYANAGI、AKIRA UENO、KAORU UJIIE、SADAO SATO
DOI:10.1248/cpb.35.53
日期:——
Three new sesquiterpenes, isozedoarondiol (8), methylzedoarondiol (9) and neocurdione (10), were isolated along with germacrone (1), curdione (2), (4S, 5S) -germacrone 4, 5-epoxide (3), dehydrocurdione (4), procurcumenol (5), zedoarondiol (6) and curcumenone (7) from Curcuma aromatica SALISB. The absolute configuration of 6 was determined by X-ray analysis and chemical correlation with 3. The structures of 8, 9 and 10 were also determined.