Synthesis of bicyclic keto silanes by tandem rearrangement of silylacetylenic ketones
作者:Andrew S. Kende、Paul. Hebeisen、Ronald C. Newbold
DOI:10.1021/ja00218a060
日期:1988.5
A partir de methyl-2 trimethylsilyl-4' butyne-3' yl-3 cyclanones et de methyl-2 trimethylsilyl-5' pentyne-4' yl-3 cyclanones on obtient des methyl trimethylsilylmethyl bicyclenones
A partir demethyl-2 trimethylsilyl-4' butyne-3' yl-3 cyclanones et demethyl-2 trimethylsilyl-5' pentyne-4'yl-3 cyclanones on obtient desmethyl trimethylsilylmethyl bikenones
Dedoublement et configuration absolue de la methyl-3 δ3(3a)-hydrindenone-4.etude de l'isomerisation en methyl-3 δsu3a(7a)-hydrindenone-4.
During the hydrogenation of the Δ3(3a)-4-hydrindenones or on Pd or Ni, we observe a shift of the double bond to Δ3a(7a)-4-hydrindenones and . The absolute configuration established for ketones and shows that the reaction is a suprafacial process. By deuteriation experiments, we observe that the reaction is irreversible and occurs with a molecular hydrogen exchange.
作者:Jonathan Chung、Joseph S. Capani、Matthias Göhl、Philipp C. Roosen、Christopher D. Vanderwal
DOI:10.1021/jacs.3c00448
日期:2023.3.22
the synthesis of the strained, cage-like antiviral diterpenoids wickerols A and B is described. Initial attempts to access the carbocycliccore were surprisingly challenging and in retrospect, presaged the many detours needed to ultimately arrive at the fully adorned wickerol architecture. In most cases, conditions to trigger desired outcomes with respect to both reactivity and stereochemistry were
描述了合成紧张的笼状抗病毒二萜化合物 wickerols A 和 B 的成功策略的演变。进入碳环核心的最初尝试具有惊人的挑战性,现在回想起来,预示着最终到达完全装饰的柳条架构所需的许多弯路。在大多数情况下,在反应性和立体化学方面触发预期结果的条件来之不易。成功的合成最终在几乎所有生产性键形成事件中都利用了烯烃。一系列共轭加成反应生成了稠合的三环核心,克莱森重排用于安装一个否则无法控制的含甲基手性中心,普林斯环化关闭了紧张的桥接环。
Stereochimie de l'hydrogenation des (±) Δ3(3a)-hydrindenones-4. Comparaison avec le cas de la (+) methyl-3 Δ3(3a)-hydrindenone-4 et de ses dioxolannes
作者:Gilbert Dana、Feiga Weisbuch、Brigitte Lo Cicero、Jean-Michel Drancourt、Jacqueline Mercier
DOI:10.1016/s0040-4020(01)96525-1
日期:1985.1
Ring cleavage and reconstruction of five and six membered ring