<i>tert</i>-Butoxide-Mediated Arylation of 2-Substituted Cyanoacetates with Diaryliodonium Salts
作者:Xiaofei Qian、Jianwei Han、Limin Wang
DOI:10.1002/adsc.201501013
日期:2016.3.17
A transition metal‐free direct arylation of 2‐substituted cyanoacetates with diaryliodoniumsalts was developed. With this approach, a wide range of α‐tolunitrile derivatives has been synthesized in good to excellent yields of 45–92%. Furthermore, the practicability of this approach is further manifested in the synthesis of a related bioactive agent of glutarimide.
Palladium-Catalyzed Chemoselective Activation of sp<sup>3</sup> vs sp<sup>2</sup> C–H Bonds: Oxidative Coupling To Form Quaternary Centers
作者:Gang Hong、Pradip D. Nahide、Uday Kumar Neelam、Peter Amadeo、Arjun Vijeta、John M. Curto、Charles E. Hendrick、Kelsey F. VanGelder、Marisa C. Kozlowski
DOI:10.1021/acscatal.9b00091
日期:2019.4.5
activation of alkyl C–H bonds vs arene C–H bonds with Pd(OAc)2 has been found to be generalizable to a number of nucleophilic substrates, allowing the formation of a range of hindered quaternary centers. The substrates share a common mechanistic path wherein Pd(II) initiates an oxidative dimerization. The resultant dimer modifies the palladium catalyst to favor activation of alkyl C–H bonds, in contrast to
Parallel Kinetic Resolution through Palladium-Catalyzed Enantioselective Cycloimidoylation: En Route to Divergent <i>N</i>-Heterocycles Bearing a Quaternary Stereogenic Center
An example of a parallel kineticresolution catalyzed by palladium to produce enantioenriched five- and six-membered N-heterocycles in one pot was developed. Dihydroisoquinolines and 1H-isoindoles containing a quaternary stereogenic center were obtained from racemic isocyanides in high yields with good enantioselectivities under mild conditions. A 6,6′-dipropyl substituted SPINOL-derived phosphoramidite
Palladium-Catalyzed One-Pot Synthesis of 2-Alkyl-2-arylcyanoacetates
作者:Xiang Wang、Anil Guram、Emilio Bunel、Guo-Qiang Cao、Jennifer R. Allen、Margaret M. Faul
DOI:10.1021/jo7024338
日期:2008.2.1
[GRAPHICS]A one-pot procedure for the synthesis of 2-alkyl-2-arylcyanoacetates based on a Pd(OAc)(2)/DPPF (DPPF = 1,1'-diphenylphosphino ferreocene)-catalyzed enolate arylation followed by in situ alkylation has been developed. This procedure tolerates a diverse range of aryl and heteroaryl bromides, and provides a rapid entry to a variety of 2-alkyl-2-arylcyanoacetates in good to excellent yield.