Lewis Acid Catalyzed Cascade Reactions of Diarylvinylidenecyclopropanes and 1,1,3-Triarylprop-2-yn-1-ols or Their Methyl Ethers
作者:Min Shi、Liang-Feng Yao
DOI:10.1002/chem.200800421
日期:2008.9.26
The reactions of vinylidenecyclopropanes 1 with 1,1,3-triarylprop-2-yn-1-ols or their methyl ethers 2 in the presence of a Lewisacid selectively produce 4-dihydro-1H-cyclopenta[b]naphthalene derivatives 3 or 1,2,3,8-tetrahydrocyclopenta[a]indene derivatives 4 depending on the substituents on the cyclopropane. Good to high yields are obtained under mild conditions. A plausible cascade Meyer-Schuster
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
Lewis Acid Catalyzed Reaction of Arylvinylidenecyclopropanes with Acetals: A Facile Synthetic Protocol for the Preparation of Indene Derivatives
作者:Jian-Mei Lu、Min Shi
DOI:10.1021/ol062189a
日期:2006.11.9
[Structure: see text] A number of highly substituted indene derivatives have been prepared in good yields by the reactions of arylvinylidenecyclopropanes 1 with acetals 2 in the presence of Lewis acid under mild conditions. The reaction is believed to proceed via regioselective addition of oxonium intermediate to arylvinylidenecyclopropane and the subsequent intramolecular Friedel-Crafts reaction.
Lithium Diisopropylamide-Mediated Carbolithiation Reactions of Vinylidenecyclopropanes and Further Transformations of the Adducts
作者:Jian-Mei Lu、Min Shi
DOI:10.1002/chem.200900068
日期:2009.6.8
Synthetic methods: Lithiumdiisopropylamide‐mediated highly selective carbolithiation reactions of vinylidenecyclopropanes are described and further transformations of these adducts were performed in the presence of Lewis or Brønsted acids (see scheme for sample reactions).
LDA-Mediated Cascade Carbolithiation Reactions of Vinylidenecyclopropanes with Enones and N-Sulfonated Imines as well as Nitroalkene and (Phenylmethylidene)malononitrile
作者:Bei-Li Lu、Jian-Mei Lu、Min Shi
DOI:10.1002/ejoc.201101403
日期:2012.1
LDA-mediatedcascadecarbolithiationreactions of vinylidenecyclopropanes with enones and N-sulfonatedimines as well as nitroalkene and (phenylmethylidene)malononitrile in THF at –78 °C have been realized; the corresponding novel adducts were produced in moderate to good yields with moderate to high diastereoselectivities. The scope and limitations are discussed as well as a plausible reaction mechanism