Gold(I)-Catalyzed Tandem Oxidative Ring-Opening/CC Bond Cleavage Reactions of Vinylidenecyclopropanes with Secondary Amines Under an Oxygen Atmosphere
作者:Bei-Li Lu、Min Shi
DOI:10.1002/chem.201100862
日期:2011.8.8
A Midas touch! Gold(I)‐catalyzed tandem oxidative ring‐opening/CCbondcleavagereactions of vinylidenecyclopropanes with a variety of secondary amines proceeded smoothly in toluene or 1,1,2,2‐tetrachloroethane (TCE) to give the corresponding amides in moderate to good yields under oxygen atmosphere (see scheme; DCE=1,2‐dichloroethane). The scope and limitations as well as the plausible mechanisms
Reactions of Vinylidenecyclopropanes with Diphenyl Diselenide in the Presence of AIBN and Thermally-Induced Further Transformations
作者:Wei Yuan、Yin Wei、Min Shi、Yuxue Li
DOI:10.1002/chem.201103461
日期:2012.1.27
vinylidenecyclopropanes with diphenyl diselenide in the presence of AIBN and upon heating gives the corresponding bicyclo[3.1.0]hexane derivatives in good yields. These compounds undergo thermal‐induced radical 1,4‐hydrogen shifts through a ring‐opening pathway of allylic cyclopropane to give the corresponding cyclohexene derivatives stereoselectively in good yields at 200 °C (see scheme).
An Efficient Method for the Synthesis of Alkylidenecyclobutanones by Gold-Catalyzed Oxidative Ring Enlargement of Vinylidenecyclopropanes
作者:Wei Yuan、Xiang Dong、Yin Wei、Min Shi
DOI:10.1002/chem.201201161
日期:2012.8.20
Rings of gold: Vinylidenecyclopropanes can undergo efficientoxidativeringenlargements under mild conditions to give the corresponding alkylidenecyclobutanone derivatives in good yields (see scheme). A plausible mechanism for this transformation has been proposed, and a new AuI–N complex, which can be used as an efficient catalyst in this oxidation reaction, has been isolated.
金戒指:亚乙烯基环丙烷在温和的条件下可以进行有效的氧化环扩环,从而以高收率得到相应的亚烷基环丁酮衍生物(参见方案)。已经提出了这种转化的合理机制,并且已经分离出可以用作该氧化反应的有效催化剂的新的Au I – N络合物。
Acid-Catalyzed Cascade Ring-Opening and Addition Reactions of Arylvinylcyclopropenes with α,β-Unsaturated Substrates, Scope and Limitations
作者:Zhi-Bin Zhu、Min Shi
DOI:10.1021/jo802786r
日期:2009.3.20
produce the Diels−Alder adducts in moderate to good yields through a cascade ring-opening reaction/Diels−Alder cycloaddition. On the other hand, strong Brønsted acid TfOH can promote the cascade intramolecular Friedel−Crafts/1,4-addition reaction to produce indene derivatives in moderate to good yields under mild conditions. The acidity of the catalysts plays a key role in these reactions.