The palladium-catalyzed hydroarylation of arenediazonium tetrafluoroborates with norbornene derivatives and analogues in the presence of Pd(OAc)2 and i-Pr3SiH in THF affords hydroarylation products containing the added aryl unit in the exo position in good to high yields. The reaction tolerates a variety of useful functional groups and can be performed as a one-pot procedure generating the arenediazonium salt in situ.
An efficient protocol for the synthesis of syn-facially bridged norbornane frameworks has been developed via tandemcyclization–cycloadditionreactions of rhodiumcarbenoids generated from α-diazo ketones. Using this new methodology, various functionalized syn-facially bridged norbornane frameworks have been synthesized in a stereoselective manner.
Inspired by substrates-recognition of enzymes, we prepared supramolecular catalyst (Ru-βCD Cat) for ring-opening metathesis polymerization (ROMP) by modifying second generation Grubbs catalyst® (M204) with β-cyclodextrin (βCD) derivative (VPhe-βCD). The ROMP activity of Ru-βCD Cat was demonstrated using 7-oxanorbornene-2,3-dicarboxylic acid dimethyl ester (ONorCOOMe). The VPhe-βCD cavity recognized
A Highly Efficient Palladacycle Catalyst for Hydrophenylation of C-, N-, and O-Substituted Bicyclic Alkenes under Aerobic Condition
作者:Ke Yuan、Ting Ke Zhang、Xue Long Hou
DOI:10.1021/jo050491b
日期:2005.7.1
A new phosphine-free palladacycle catalyst 4 was prepared from benzyl oxazoline in high yield and fully characterized. With it as catalyst, hydrophenylation reactions of a wide range of bicyclic alkenes, not only norbornene and norbornadiene but also oxa- and aza-bicyclic alkenes, with iodobenzene proceeded smoothly under aerobic condition without exclusion of water. Up to 1.7 x 10(6) TON as well as 1.2 x 10(5) TOF were achieved.