作者:Fuzhuo Li、Qian Tu、Sijia Chen、Lei Zhu、Yu Lan、Jianxian Gong、Zhen Yang
DOI:10.1002/anie.201700838
日期:2017.5.15
The first enantiospecific synthesis of hispidanin A (4), a dimeric diterpenoid from the rhizomes of Isodon hispida, was achieved with a longest linear sequence of 12 steps in 6.5 % overall yield. A key component is the use of the abundant and naturally occurring diterpenoids (+)‐sclareolide and (+)‐sclareol as starting materials, which enables the gram‐scale preparation of the key intermediates totarane
Synthesis of [4.3.3]Propellanes by Carbenium-Ion Rearrangement and Their Olfactory Characterization
作者:Georg Fráter、Daniel Helmlinger、Philip Kraft
DOI:10.1002/hlca.200390067
日期:2003.3
illustrating the utility and scope of this reaction. The olfactoryproperties of the synthesized [4.3.3]propellanes as well as of the original target structures 10, 33, and 34, prepared from (−)-12 and (−)-15, are discussed. Especially the pronounced ambra odor of (−)-17 vividly contradicts the ‘triaxial rule of amber sensation' and provides new insight into the structural requirements for ambra odorants
Cyclisation homologer Sesquiterpensäuren. II. Konfiguration der totalsynthetischen stereoisomeren dl-Laktone C16H26O2
作者:G. Lucius
DOI:10.1002/ardp.19582910202
日期:——
carbobicyclische stereoisomere racemische Laktone, deren konfigurative Beziehungen zu den drei bekannten optischaktiven raumisomeren Laktonen untersucht werden. Die Laktone mit Schmp. 79° und Schmp. 97° erweisen sich als Racemate der aktiven Isomeren mit Schmp. 93° bzw. 133°. Für das dritte inaktive Lakton wird eine Raumformel vorgeschlagen.
Die säurekatalysierte Cyclisation von Monocyclohomofarnesylsäure-äthylester liefert drei carbobicyclischestereoisomere racemische Laktone, deren konfigurative Beziehungen zu den drei bekannten optisch aktiven raumisomeren Laktonen untersucht Die Laktone mit Schmp。79° 和 Schmp。97° erweisen sich als Racemate der aktiven Isomeren mit Schmp。93° bzw。133°。Für das dritte inaktive Lakton wird eine Raumformel
CYCLIZATION OF E,E-HOMOFARNESIC ACID AND ITS RELATED COMPOUNDS
作者:Akira Saito、Hajime Matsushita、Hajime Kaneko
DOI:10.1246/cl.1984.591
日期:1984.4.5
Acid-catalyzed cyclization of homofarnesic acid was examined in detail. E,E- and Z,E-homofarnesic acid in dichloromethane cyclyzed by catalysis of boron trifluoride etherate at −20°C to afford trans-anti-trans and trans-syn-cis norambreinolide in 38% and 52% yield respectively. Cyclization mechanism was discussed.
9a-dimethylnaphtho[2,1-b]furans) have been synthesized and subjected to sensory evaluation. Threshold data and odor determination give an enlarged insight into the structure-activity relationship (SAR) in ambrox-type ambergris fragrances. As a general conclusion, the accumulation of axial CH3 groups in the tricyclic ethers 1–12 leads to the strongest receptor affinity.
非对映异构体18-norrambrox和19-norambrox((6α)-和(6β)-dodecahydro-3a,6,9a-三甲基萘[2,1- b ]呋喃)和相应的18,19-dior -衍生物(dodecahydro-3a,9a-二甲基萘[2,1- b ]呋喃)已经合成并进行了感官评估。阈值数据和气味测定可提供对ambrox型龙涎香香料的结构-活性关系(SAR)的深入了解。作为一般的结论,轴向CH积累3个在三环基团醚1 - 12通向最强受体的亲和力。