Aerobic Dimerization of Enediyne Compounds: Construction of Naphthalene Frameworks
作者:Dongxu Wang、Fei Ling、Xiang Liu、Zexiang Li、Cheng Ma
DOI:10.1002/chem.201504085
日期:2016.1.4
annulation of enediynecompounds leading to naphthaleneframeworks has been developed by using Pd(OAc)2 as the catalyst in the presence of NaI under O2 (1 atm). This reaction provided efficient access to a class of symmetric core‐annulated naphthalenes by the homoannulation of enediyne–imides. Intriguingly, the crossover annulation of enediyne–imides and other functionalized enediynes could also be
Studies toward the synthesis of natural and unnatural dienediynes 1. Approaches to a functionalised bicyclic ring system
作者:S Caddick、V.M Delisser、V.E Doyle、S Khan、A.G Avent、S Vile
DOI:10.1016/s0040-4020(99)00045-9
日期:1999.2
The synthesis of a functionalised bicyclic ringsystem related to the naturally occurring dienediynes, NCS and Kedarcidin Chromophores is presented. Key steps involve: conjugate addition of an enediyne to a functionalised enone and intramolecular boron mediated aldol reaction.
investigated. Benzene-bridged bis(propargyl alcohols) reacted with both electron-deficient and electron-richolefins to give the corresponding [4 + 2] cycloadducts. Ethylene-bridged bis(propargyl alcohols) underwent similar cycloaddition with electron-deficient olefins. Construction of some heterocycles based on the newly developed sequential reaction is also described.
Sequential pericyclic reaction of ene-diallene: synthesis of (±)-estrone
作者:Hirohumi Hakuba、Shinji Kitagaki、Chisato Mukai
DOI:10.1016/j.tet.2007.10.008
日期:2007.12
The one-pot construction of perhydrophenanthrene from an acyclic substrate was achieved via a sequential pericyclicreaction, which involved the in situ generation of ene-diallene species due to Myers' propargyl alcohol–allene transformation. The resulting perhydrophenanthrene derivative could be successfully converted into (±)-estrone.
Highly regioselective palladium-mediated synthesis of stereoisomerically pure (Z)- and (E)-alkyl 2-bromo-3-(hetero)arylpropenoates
作者:Fabio Bellina、Adriano Carpita、Massimo De Santis、Renzo Rossi
DOI:10.1016/0040-4039(94)85040-2
日期:1994.9
Stereoisomericallypure (Z)- and (E)-alkyl2-bromo-3-(hetero)arylpropenoates, (Z)- and (E)-2, have been efficiently and selectively prepared by Pd(0)-mediated cross-coupling reaction between (hetero)arylzinc halides, 5, and easily available (Z)- and (E)-alkyl 2,3-dibromopropenoates, (Z)- and (E)-4, respectively. Compounds (Z)- and (E)-2 serve as useful precursors to stereoisomericallypure trisubstituted