双环[3.2.1]辛-3-烯-外-2-醇 在
palladium on barium sulfate 氢气 作用下,
生成 Bicyclo<3.2.1>octan-exo-2-ol
参考文献:
名称:
Ionic Reactions in Bicyclic Systems. I. The Preparation and Assignment of Configuration of the Isomeric Bicyclo [3.2.1]oct-3-en-2-ols and Bicyclo [3.2.1]octan-2-ols
The intramolecular reaction between a diazoalkane group and an ester group: a search for other examples
作者:Eric H. Billett、Ian Fleming、Steven W. Hanson
DOI:10.1039/p19730001661
日期:——
The reactions of eight N-nitroso-lactams with sodium methoxide are described. In most cases the intermediate diazoalkaneester does not give an insertion product of the kind described in the preceding paper, but gives instead the solvolysis products—ethers and/or olefins. The intramolecularreactionbetween a diazoalkane and an estergroup is not therefore a promising one for synthesis. One other example
描述了八种N-亚硝基内酰胺与甲醇钠的反应。在大多数情况下,中间体重氮链烷酸酯不会产生前文所述类型的插入产物,而是会产生溶剂分解产物(醚和/或烯烃)。因此,重氮烷烃与酯基团之间的分子内反应对于合成而言并不是有希望的反应。然而,观察到重氮烷烃酯反应的另一个实例:4-亚硝基-4-氮杂ah金刚丹-5-酮(24)给出了14%产率的甲基金刚烷丹-3-羧酸甲酯(27)。另一种亚硝基内酰胺3- nitroso -3- aza- A -homocholest-4a-en-4-one(32)甚至未能提供重氮烷烃,而是重新排列为异构体甲基(3-nitroso-3 -氮杂-A-nor-5ξ-胆甾烷-5-基)乙酸酯(34)。
Stereo- and enantio-controlled synthesis of (+)-juvabione and (+)-epijuvabione from (+)-norcamphor
作者:Mitsuhiro Kawamura、Kunio Ogasawara
DOI:10.1039/c39950002403
日期:——
(+)-Juvabione and (+)-epijuvabione, natural sesquiterpenes exhibiting insect juvenile hormone activity, have been synthesized with complete stereo- and enantio-control using (+)-norcamphor as the chiral precursor via both the enantiomeric bicyclo[3.2.1]octenone intermediates.
Monochloro- and monobromocarbene undergo exo addition to norbornene to give exo-anti-3-halotricyclo[3.2.1.02,4octene-2. The exo-anti adducts were found to be remarkably stable, in contrast to the exo-syn adducts, which, though not observed, were presumed to be the labile precursors of the rearranged products. The reasons for these stereochemical differences are discussed.
Bromine has been shown to add to bicyclo(3.2.1)octene-2 without rearrangement. Epoxidation leads to the exo-epoxide.
已证明溴可不加重排地添加到双环(3.2.1)辛烯2中。环氧化导致的外-epoxide。
Asymmetric allylic oxidation of bridged-bicyclic alkenes using a copper-catalysed symmetrising–desymmetrising Kharasch–Sosnovsky reaction
作者:J. Stephen Clark、Melanie-Rose Clarke、John Clough、Alexander J. Blake、Claire Wilson
DOI:10.1016/j.tetlet.2004.10.093
日期:2004.12
Enantioselective symmetrising-desymmetrising allylic oxidation of racemic bridged bicyclic alkenes using an asymmetric copper-catalysed Kharasch-Sosnovsky reaction has been explored. Good yields and reasonable levels of induction (up to 70% ee) have been obtained using carbocyclic systems as substrates. (C) 2004 Elsevier Ltd. All rights reserved.