Catalytic Anti-Markovnikov Hydrobromination of Alkynes
作者:Mycah R. Uehling、Richard P. Rucker、Gojko Lalic
DOI:10.1021/ja503944n
日期:2014.6.18
We have developed the first catalytic method for anti-Markovnikovhydrobromination of alkynes. The reaction affords terminal E-alkenyl bromides in high yield and with excellent regio- and diastereoselectivity. Both aryl- and alkyl-substituted terminal alkynes can be used as substrates. Furthermore, the reaction conditions are compatible with a wide range of functional groups, including esters, nitriles
for the preparation of 3-substituted isocoumarins via palladium-catalyzed nucleophilic addition/oxidative annulation of bromoalkynes with benzoic acids has been developed. Remarkably, preliminary mechanistic studies indicated that the transformation might proceed via a stereo- and regioselective nucleophilic addition and C–H functionalization procedure.
Chiral α,β-Dialkoxy- and α-Alkoxy-β-aminostannanes: Preparation and Copper-Mediated Cross-Coupling
作者:Suchismita Mohapatra、A. Bandyopadhyay、D. K. Barma、Jorge H. Capdevila、J. R. Falck
DOI:10.1021/ol035458v
日期:2003.12.1
diastereoselectivity (up to 98% de). syn-Isomers are accessed from the initial adducts via Mitsunobu inversion/saponification. The corresponding thionocarbamates undergo mild Cu(I)-mediated cross-coupling with a variety of organic halides, inter alia, allylic, cinnamylic, propargylic, and acetylenic, with retention of configuration. [reaction: see text]
Transmetalation of Alkylzirconocenes in Copper-Catalyzed Alkyl-Alkynyl Cross-Coupling Reactions
作者:Kiran Indukuri、Olivier Riant
DOI:10.1002/adsc.201700164
日期:2017.7.17
simple copper‐catalyzed alkyl–alkynyl cross‐coupling strategy has been developed using the reaction between alkynyl bromides and alkylzirconocenes. The alkylzirconocenes were generated in situ via regioselective addition of Schwartz's reagent (ZrCp2HCl) on to alkenes. The reaction has a broad scope, a range of functionalized bromoalkynes and alkylzirconium reagents were successfully coupled, resulting in