A short enantioselective synthesis of (+)-sterpurene: complete intramolecular transfer of central to axial to central chiral elements
作者:Richard A. Gibbs、William H. Okamura
DOI:10.1021/ja00220a069
日期:1988.6
L'etape cle de la synthese est une addition de Diels Alder intramoleculaire et stereoselective du (dimethyl-4,4 methyl-2' cyclobutene-1'yl-1) heptene-6yne-1ol-3, obtenu a partir du dimethyl-4,4 heptene-6yne-1ol-3
L'etape cle de la synthese est une added de Diels Alder intramoleculaire et立体选择性 du (dimethyl-4,4methyl-2' cyclobutene-1'yl-1) heptene-6yne-1ol-3, obtenu a partir du dimethyl-4 ,4 庚烯-6yne-1ol-3
Intramolecular C−H Insertion Reactions of (η<sup>5</sup>-Cyclopentadienyl)dicarbonyliron Carbene Complexes: Scope of the Reactions and Application to the Synthesis of (±)-Sterpurene and (±)-Pentalenene
作者:Shingo Ishii、Shikai Zhao、Goverdhan Mehta、Christopher J. Knors、Paul Helquist
DOI:10.1021/jo001792i
日期:2001.5.1
products of the intramolecular insertion reactions are substituted bicyclo[n.3.0]alkanones. The scope and limitations of the reaction are described. The reaction is applied to a total synthesis of sterpurene and to a formal synthesis of pentalenene. Overall, this approach to cyclopentane annulation complements the related metal-catalyzed insertion reactions of diazocarbonyl compounds, which are also
An enantioselective central-axial-central chiral element transfer process leading to a concise synthesis of (+)-sterpurene: intramolecular Diels-Alder reactions of vinylallene sulfoxides
作者:Richard A. Gibbs、Karin Bartels、Robert W. K. Lee、William H. Okamura
DOI:10.1021/ja00192a033
日期:1989.5
The intramolecularDiels-Alder (IMDA) reaction of vinylallenesulfoxide 19 as the diene component occurs in a rapid and stereoselective manner at room temperature to give tricyclic 20 in good yield. Sulfoxide 19 cyclizes approximately} 140 times faster than the corresponding hydrocarbon 15a. It was also shown that gem-dimethyl substitution on the tether linking the vinylallene and vinyl group accelerates
On a new synthesis of sterpurene and the bioactivity of some related <i>Chondrostereum</i><i>purpureum</i> sesquiterpene metabolites
作者:George M. Strunz、Richard Bethell、Michael T. Dumas、Nick Boyonoski
DOI:10.1139/v97-090
日期:1997.6.1
mycoherbicide, was synthesized by a six-step sequence, in 33% overall yield. The key steps were a thermal [4 + 2] (Diels–Alder) cycloaddition of a ketene acetal diene with a conjugated ester dienophile, and a remarkably stereoselective [2 + 2] photocycloaddition of ethylene with the resulting conjugated ketone. Several related, more highly oxygenated, metabolites isolated from culture filtrates of C. purpureum
Sterpurene 是 Chondrostereumpurpureum 的倍半萜烃代谢物,是一种植物病原体和潜在的除真菌剂,通过六步序列合成,总产率为 33%。关键步骤是乙烯酮缩醛二烯与共轭酯亲二烯体的热 [4 + 2] (Diels-Alder) 环加成,以及乙烯与所得共轭酮的显着立体选择性 [2 + 2] 光环加成。从 C. purpureum (cf. Ayer) 的培养滤液中分离出的几种相关的、氧化程度更高的代谢物进行了对杂种白杨、Populusdeltoides X nigra 细胞的毒性测试。它们的植物毒性,浓度低至 10 ppm,表明,就像真菌产生的内聚半乳糖醛酸酶一样,这些倍半萜烯可能是造成与落叶物种被病原体感染相关的叶损伤的部分原因。关键词: Chondrostereumpurpureum, mycoherbicide, 代谢物, sterpurenes, 合成, Diels-Alder
A 4+3 Cycloaddition Approach to the Synthesis of (±)-Sterpurene
作者:Michael Harmata、Gary J. Bohnert
DOI:10.1021/ol027176l
日期:2003.1.1
A synthesis of the sesquiterpene sterpurene is presented. Key steps include a 4+3cycloaddition reaction and a quasi-Favorskii rearrangement. [reaction--see text]