Diversity Oriented Synthesis of Hispanane-like Terpene Derivatives from (R)-(+)-Sclareolide
作者:María C. de la Torre、Isabel García、Miguel A. Sierra
DOI:10.1002/chem.200401220
日期:2005.6.6
(R)-(+)-Sclareolide 1 has been used as a starting material to develop a diversityoriented methodology to access hispanane 28 a, and hispanane-likederivatives 27 b-27 e. This methodology is based on the intramolecular Friedel-Crafts acylation of the corresponding 12-desoxylabdanoic-like acids 27, for the construction of the cycloheptane ring which is characteristic of the hispananes. Acids 27 are
Stereocontrolled Synthesis of (+)-Acuminolide and Determination of Its Absolute Configuration
作者:Noriyuki Furuichi、Mariko Kato、Shigeo Katsumura
DOI:10.1246/cl.1999.1247
日期:1999.11
As a demonstration for an easy supply of the enantiomerically pure intermediate for the synthesis of labdane diterpenoids, stereocontrolled synthesis of (+)-acuminolide was achieved, and its absolute configuration was determined.
Synthesis of (+)-Zerumin B Using a Regioselective Singlet Oxygen Furan Oxidation
作者:Ioannis Margaros、Georgios Vassilikogiannakis
DOI:10.1021/jo7025405
日期:2008.3.1
(+)-zerumin B has been accomplished starting from (+)-sclareolide. At the heart of the synthetic strategy lies the regioselective formation of the α-substituted γ-hydroxybutenolide moiety of zerumin B. This was achieved by means of a [1,4] O→C triisopropylsilyl migration followed by singletoxygen (1O2) oxidation of the resulting 2-triisopropylsilyl-3-(α-hydroxy)alkylfuran.
从(+)-香紫苏内酯开始已经完成了短而有效的抗肿瘤二萜类(+)-血清白蛋白B的合成。合成策略的核心在于区域选择性形成塞鲁米宁B的α-取代的γ-羟基丁烯内酯部分。这是通过[1,4] O→C三异丙基甲硅烷基迁移,然后通过单线态氧(1 O 2)实现的氧化所得的2-三异丙基甲硅烷基-3-(α-羟基)烷基呋喃。
Photochemical Access to Tetra- and Pentacyclic Terpene-like Products from <i>R</i>-(+)-Sclareolide
作者:María C. de la Torre、Isabel García、Miguel A. Sierra
DOI:10.1021/jo034177y
日期:2003.8.1
Fused tetracyclic oxetanes 4, highly substituted cyclobutenes 6, and the pentacyclic derivatives 7 and 8 were obtained by irradiation of derivatives 3 that were prepared from commercial R-(+)-sclareolide (1) in three steps. Compounds 4 are formed through a Paterno-Buchi reaction, while tricyclic derivatives 6 are the fragmentation products of the first formed oxetanes. In clear contrast, cyclopentenyl and 3-furyl derivatives, 3e and 3f, gave the [2+2] adducts, namely pentacyclic derivatives 7 and 8. All the reported reactions are totally regio- and stereoselective, with the exception of the cyclization of furyl derivative 3f, which gave the mixture of both the crossed (7b) and the right (8) isomers.
Synthesis of Chinensines A−E
作者:Ioannis Margaros、Georgios Vassilikogiannakis
DOI:10.1021/jo070527v
日期:2007.6.1
Short and efficient syntheses of coronarin E (4) and chinensines A-E (5-9) have been accomplished. The use of two different types of reaction of singlet oxygen (O-1(2)) lies at the heart of the synthetic strategy. The syntheses have facilitated the clarification of certain previously unknown, or unconfirmed, stereochemical details (the relativity stereochemistries of chinensines D and E and the absolute stereochemistries for all the synthesized family members).