Configurational analysis of new furanosesquiterpenes from Dysidea herbacea. Assignment of absolute stereochemistry.
作者:Philip A. Searle、Nasa M. Jamal、Greg M. Lee、Tadeusz F. Moliski
DOI:10.1016/s0040-4020(01)89664-2
日期:1994.3
collected nearby from Norman Reef. The structures were determined by spectroscopic methods, in particular 2D NMR, and the absoluteconfigurations of the parent rings of 1 and 2 defined by chemical correlation and application of Kakisawa's of the Mosher ester method. Compounds 1 and 2 are diastereomers of acetates 5 and 6, reported earlier from D. herbacea, but have opposite configuration with respect to
两个新的海洋呋喃呋喃萜(+)-(4a S,6 R,8a S)-4,4,7-三甲基-4,4a,5,6,8,8a,9-六氢萘并[2,3- b ]呋喃乙酸-6-基乙酸酯(1)和(+)-(4a S,7 R,8a S)-6,9,9-三甲基-4,4a,7,8,8a,9-六氢萘酚[2,3 b ]呋喃-7-乙酸乙烯酯(2),是从澳大利亚大堡礁上的Har礁收集的Dysidea草本植物的分离样品。1,(-)-(4a R,6 S,8a R的对映体)-4,4,7–三甲基– 4,4a,5,6,8,8a,9–六氢萘[2.3–b]呋喃–6-乙酸乙烯酯(17)在附近采集的另一种禾本科草中发现。来自诺曼礁。通过光谱方法,特别是2D NMR确定结构,并且通过化学相关性和Mosher酯法的Kakisawa's方法定义1和2的母环的绝对构型。化合物1和2是乙酸酯5和6的非对映异构体,较早地从D.herbacea报道,但是相对于环