Transformation of 1-(1,2-propadienyl)cyclopropanols into substituted hydroquinones employing octacarbonyldicobalt
摘要:
A novel transformation of 1-(1,2-propadieny])cyclopropanols into substituted 1,4-hydroquinones has been developed utilizing the interaction of 1.2-propadienes and octacarbonyldicobalt (Co-2(CO)(8)) This reaction was applied to the synthesis of vitamin E and K analogs. (C) 1997 Elsevier Science Ltd.
Gold(I)-Catalyzed Ring Expansion of Cyclopropanols and Cyclobutanols
作者:Jordan P. Markham、Steven T. Staben、F. Dean Toste
DOI:10.1021/ja052831g
日期:2005.7.13
The reaction tolerates terminal alkynes as well as alkyl, aryl, and halo-substitution at the acetylenic position and stereoselectively provides a single olefin isomer. The gold(I)-catalyzed rearrangement is stereospecific with regard to substituents on the ring, thus providing a practical method for the stereoselective synthesis of highly substituted cyclopentanones from cyclopropanols. The reaction stereoselectively
Rearrangement of 1-(1-Alkynyl)cyclopropanols to 2-Cyclopentenones via Their Hexacarbonyldicobalt Complexes. A New Use of Alkyne−Co<sub>2</sub>(CO)<sub>6</sub> Complexes in Organic Synthesis
protective group of the substrates. This rearrangement was successfully applied to cyclopentenone annulation reactions onto cycloalkenes. An efficient synthesis of alkynyl-substituted bicyclo[n.1.0]alkanol derivativesfrom the corresponding cycloalkenes according to Danheiser's protocol was developed, and bicyclic cyclopentenones were obtained in moderate to good yield by applying to these the cobalt-mediated
1-(1-炔基) 环丙醇向 2-环戊烯-1-酮的新重排是在其炔基部分与八羰基二钴 (Co2(CO8)) 络合后进行的。1-(1-炔基) 环丙醇在其炔烃末端具有广泛的取代基,以良好的产率重排为相应的 3-取代的 2-环戊烯-1-酮。In case of the reactions of 1-alkynylcyclopropanols with an alkyl substituent on the cyclopropane ring, either 4-substituted or 5-substituted 2-cyclopenten-1-ones could be selectively obtained by appropriate choice of stereochemistry and protective group of the substrates. 这种重排成功地应用于环戊烯酮环化成环烯烃的反应。根据
A Novel Rearrangement of 1-Alkynylcyclopropanol to 2-Cyclopenten-1-one via Dicobalt Hexacarbonyl Complex
作者:Nobuharu Iwasawa
DOI:10.1246/cl.1992.473
日期:1992.3
Various 1-alkynylcyclopropanols are found to be converted to 3-substituted 2-cyclopenten-1-ones in good yields by heating their dicobalt hexacarbonyl complexes in refluxing tetrahydrofuran or dimethoxyethane.
Rearrangement of 1-Alkynylcyclopropanol to 3-Substituted 2-Cyclopentenone Promoted by a Catalytic Amount of Octacarbonyldicobalt-Triphenylphosphite
作者:Nobuharu Iwasawa、Takeshi Matsuo
DOI:10.1246/cl.1993.997
日期:1993.6
The rearrangement of 1-(1-alkynyl)cyclopropanols is catalyzed efficiently by the combined use of octacarbonyldicobalt and triphenylphosphite to give 3-substituted 2-cyclopentenones in high yields.