A Robust Palladium(II)-Porphyrin Complex as Catalyst for Visible Light Induced Oxidative CH Functionalization
作者:Wai-Pong To、Yungen Liu、Tai-Chu Lau、Chi-Ming Che
DOI:10.1002/chem.201203774
日期:2013.4.26
A series of palladium(II)–porphyrin complexes that display dual emissions with lifetimes up to 437 μs have been synthesized. Among the four complexes, PdF20TPP is an efficient and robust catalyst for photoinduced oxidativeCHfunctionalization by using oxygen as terminal oxidant. α‐Functionalized tertiary amines were obtained in good to excellent yields by light irradiation (λ>400 nm) of a mixture
Direct Access to Anthranilic Acid Derivatives via CO<sub>2</sub> Incorporation Reaction Using Arynes
作者:Hiroto Yoshida、Takami Morishita、Joji Ohshita
DOI:10.1021/ol801588s
日期:2008.9.1
CO2 was found to be directly convertible into anthranilicacid derivatives of great synthetic value through a three-component coupling using arynes and amines. Zwitterions arising from nucleophilic attack of amines to arynes serve as key intermediates in the coupling.
Intramolecular Functionalization of Benzylic Methylene Adjacent to the Ring Nitrogen Atom in <i>N</i>-Aryltetrahydroisoquinoline Derivatives
作者:Liu Yang、Daisy Zhang-Negrerie、Kang Zhao、Yunfei Du
DOI:10.1021/acs.joc.5b02443
日期:2016.4.15
adjacent to the ring nitrogen atom in a series of N-aryltetrahydroisoquinoline compounds has been realized through intramolecular cross-dehydrogenativecouplingreactions. The presented transformation provided straightforward access to the formation of C(sp3)–Y (Y = C, N or O) bond via I(III) reagent.
Click-binol-phosphoric acid catalysts in intramolecular enantioselective oxidative C H-bond functionalization
作者:Sebastian Stockerl、Daniel Gutiérrez、Olga García Mancheño
DOI:10.1016/j.molcata.2016.09.006
日期:2017.1
Counteranion-catalysis represents an appealing but challenging approach for the development of enantioselective oxidative C-H bond functionalization reactions. In this work, a new family of 3,3'-triazolyl BINOL-derived phosphoric acids was synthesized and employed in the intramolecular asymmetric C-H bond functionalization of N-aryl substituted tetrahydroisoquinolines. As previously reported with related structures, the presence of the triazole groups on the catalysts was key to attain enantioselectivity. Our study also shows the importance of choosing the appropriate regioisomeric triazole groups at the BINOL backbone to achieve a more efficient chirality transfer. Moderate enantiomeric ratios were obtained with the N-benzamide substrates, whereas the change of the nature of the nucleophile fragment was translated to a dramatic loss of the enantioselectivity. Therefore, it can be foreseen that there is a need for designing further superior catalyst structures to develop future counter-anion organocatalyzed asymmetric C-H bond functionalization reactions. (C) 2016 Elsevier B.V. All rights reserved.
Asymmetric Cross-Dehydrogenative Coupling Enabled by the Design and Application of Chiral Triazole-Containing Phosphoric Acids
作者:Andrew J. Neel、Jörg P. Hehn、Pascal F. Tripet、F. Dean Toste
DOI:10.1021/ja407410b
日期:2013.9.25
describes the development of an enantioselective C-N bond-forming reaction to produce 1,2,3,4-tetrahydroisoquinoline-derived cyclic aminals catalyzed by chiral phosphate anions. Central to the success of this goal was the design of a library of 3,3'-triazolyl BINOL-derived phosphoricacids capable of forming attractive hydrogen-bonding interactions with the peptide-like substrate. We envision this work will