作者:Douglas C. Behenna、Justin T. Mohr、Nathaniel H. Sherden、Smaranda C. Marinescu、Andrew M. Harned、Kousuke Tani、Masaki Seto、Sandy Ma、Zoltán Novák、Michael R. Krout、Ryan M. McFadden、Jennifer L. Roizen、John A. Enquist、David E. White、Samantha R. Levine、Krastina V. Petrova、Akihiko Iwashita、Scott C. Virgil、Brian M. Stoltz
DOI:10.1002/chem.201003383
日期:2011.12.9
functions with nearly identical efficiency in terms of yield and enantioselectivity. Catalyst discovery and development, the optimization of reaction conditions, the exploration of reactionscope, and applications in target‐directed synthesis are reported. Experimental observations suggest that these alkylationreactions occur through an unusual inner‐sphere mechanism involving binding of the prochiral
Enantioselective and Regiodivergent Functionalization of<i>N-</i>Allylcarbamates by Mechanistically Divergent Multicatalysis
作者:Edward Richmond、Ismat Ullah Khan、Joseph Moran
DOI:10.1002/chem.201602792
日期:2016.8.22
A pair of mechanistically divergent multicatalytic reaction sequences has been developed consisting of nickel‐catalyzed isomerization of N‐allylcarbamates and subsequent phosphoric‐acid‐catalyzed enantioselective functionalization of the resulting intermediates. By appropriate selection of reaction partners, in situ generated imines and ene‐carbamates are mechanistically partitioned to yield opposing
An Experimental and Calculated Study of Intramolecular Hydrogen Atom Transfer in Diethylene Glycol Bis(Allyl Carbonate)†
作者:Asfia Qureshi、Carl H. Schiesser
DOI:10.1039/a707048i
日期:——
Deuterium labeling experiments and molecular orbital (MNDO) calculations indicate that 1,6-homolytic hydrogen transfer from C8 to C3 is not responsible for the products observed when diethyleneglycolbis(allylcarbonate) is treated with tert-butoxyl radicals in the presence of 1′,1′,3′,3′-tetramethylisoindolinyl-2′-oxyl.
Easy Access to Esters with a Benzylic Quaternary Carbon Center from Diallyl Malonates by Palladium-Catalyzed Decarboxylative Allylation
作者:Daisuke Imao、Akihiro Itoi、Asako Yamazaki、Masamichi Shirakura、Ryota Ohtoshi、Kenta Ogata、Yohki Ohmori、Tetsuo Ohta、Yoshihiko Ito
DOI:10.1021/jo0621569
日期:2007.3.1
used did not affect the catalytic cycle. Catalysis in [bmim][BF4], a well-known ionic liquid, was inhibited as a result of formation of a hydrogen bond between a carboxylate anion and a [bmim]+ cation; however, the reaction in [bdmim][BF4], in which the acidic proton of [bmim][BF4] was replaced with a methyl group, proceeded smoothly. The catalytic mechanism was investigated using a tetradeuterated
Ligand-Controlled Regiodivergence in the Copper-Catalyzed [2,3]- and [1,2]-Rearrangements of Iodonium Ylides
作者:Bin Xu、Uttam K. Tambar
DOI:10.1021/jacs.6b08624
日期:2016.9.21
allylic ylide rearrangements for the synthesis of complex molecules, the catalyst control of [2,3]- and [1,2]-rearrangements remains an unsolved problem. We developed the first regiodivergent [2,3]- and [1,2]-rearrangements of iodonium ylides that are controlled by copper catalysts bearing different ligands. In the presence of a 2,2'-dipyridyl ligand, diazoesters and allylic iodides react via a [2,3]-rearrangement