A Practical and General Diels–Alder Reaction of Pentafulvenes with Arynes
摘要:
A high-yielding, versatile and practical Diels-Alder reaction of pentafulvenes with arynes under mild reaction conditions is reported. The aryne generated by the fluoride induced 1,2-elimination of 2-(trimethylsilyl)aryl triflates undergoes efficient cycloaddition with 6-substituted and 6,6-disubstituted pentafulvenes leading to the formation of benzonorbornadiene derivatives.
Regioselective palladium-catalyzed allylation of fulvenes
作者:Björn C. Söderberg、Lucinda R. Austin、Carol A. Davis、Jan-Erik Nyström、Jan O. V»gberg
DOI:10.1016/s0040-4020(01)80737-7
日期:1994.4
allylic acetates, and allylic carbonates in the presence of catalytic amounts of bis(dibenzylideneacetone)palladium(O) and triphenyl phosphine in good to excellent yield. A high degree of regioselectivity is observed with regard to the allylic substrate, and the most hindered position was predominately substituted. Inversion of stereochemistry of the allylic carbon by migration of the anion from the metal
not result in an intramolecular C−C coupling reaction but led to E/Z isomerization of the alkenyl units. In solution rapid conformational metallocene equilibration takes place. Photolysis of the (Cp-alkenyl)2ZrCl2 complexes 6 in solution very efficiently resulted in the formation of the cyclobutylene-bridged ansa-zirconocene isomers 11 by rapid intramolecular [2 + 2] cycloaddition reaction by means
An efficient catalytic method for fulvene synthesis
作者:Necdet Coşkun、Ihsan Erden
DOI:10.1016/j.tet.2011.09.036
日期:2011.11
added water and solvent on the condensation of carbonyl compounds with cyclopentadiene in the presence of secondary amines were investigated. Based on these studies, a new efficient and green synthesis of fulvenes was developed.
In situ generated acetone pyrrolidine enamine undergoes [6 + 2] cycloadditions with fulvenes to give 1,2-dihydropentalenes. This ring annulation method works particularly well with 6-monosubstituted fulvenes and is subject to steric hindrance at C-6 of the fulvene. On the basis of mechanistic studies, optimal conditions have been developed for a one-pot synthesis of 1,2-dihydropentalenes using catalytic
Fulvenes as Effective Dipolarophiles in Copper(I)-Catalyzed [6+3] Cycloaddition of Azomethine Ylides: Asymmetric Construction of Piperidine Derivatives
作者:Zhao-Lin He、Huai-Long Teng、Chun-Jiang Wang
DOI:10.1002/anie.201208799
日期:2013.3.4
6π dipolarophiles in the title reaction in the presence of the chiral CuI/(S)‐L complex. The present system provides a unique and straightforward access to enantioenriched, highly functionalized piperidine derivatives in good yields and excellent diastereoselectivities and enantioselectivities.
就像π一样容易:在手性Cu I /(S)-L络合物存在下,标题反应中的Fulvenes充当6πdipolarophiles 。本系统以良好的产率和优异的非对映选择性和对映选择性提供了对映体富集的,高度官能化的哌啶衍生物的独特而直接的途径。