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
A Catalytic Method for the Preparation of Polysubstituted Cyclopentanes: [3+2] Cycloaddition of Vinylidenecyclopropanes with Activated Olefins Catalyzed by Triflic Imide
作者:Wei Li、Min Shi
DOI:10.1021/jo802294s
日期:2009.1.16
[3+2] Cycloadditions of vinylidenecyclopropanes (VDCPs) with electron-deficient olefins, such as methyl vinyl ketone (MVK) and acrylaldehyde, proceed smoothly in the presence of a catalytic amount of triflic imide (Tf2NH) to give the corresponding functionalized cyclopentanes in good to high yields.
Lewis Acid Catalyzed Cascade Reactions of 1,6-Diynes and 1,6-Enynes with Vinylidenecyclopropanes
作者:Liang-Feng Yao、Min Shi
DOI:10.1002/chem.200802284
日期:2009.4.6
Cascadereactions: Lewisacidcatalyzedcascadereactions of 1,6‐diynes and 1,6‐enynes with arylvinylidenecyclopropanes produce polycyclic compounds and isopropylidene‐3,3‐diarylcyclobut‐1‐enylmethyl derivatives (see scheme) in good to high yields along with a PtCl2‐catalyzed cyclization and a Cu(OAc)2⋅H2O‐catalyzed Eglinton coupling reaction.
LDA-Mediated Selective Addition Reaction of Vinylidenecyclopropanes with Aldehydes, Ketones, and Enones: Facile Synthesis of Vinylcyclopropenes, Allenols, and 1,3-Enynes
作者:Jian-Mei Lu、Min Shi
DOI:10.1021/ol800463k
日期:2008.5.1
Highly selective addition reaction of vinylidenecyclopropanes 1 was realized by treatment with LDA in THF and quenching with aldehydes, ketones, and enones. A number of vinylcyclopropenes, allenols, and 1,3-enynes were obtained selectively in moderate to good yields depending on the nature of different electrophiles.