Pyrrole Synthesis via Allylic sp<sup>3</sup> C−H Activation of Enamines Followed by Intermolecular Coupling with Unactivated Alkynes
作者:Souvik Rakshit、Frederic W. Patureau、Frank Glorius
DOI:10.1021/ja104305s
日期:2010.7.21
A conceptually novel pyrrole synthesis is reported, efficiently merging enamines and (unactivated) alkynes under oxidative conditions. In an intermolecular Rh catalyzed process, the challenging allylic sp(3) C-H activation of the enamine substrates is followed by the cyclization with the alkyne (R(3) = CO(2)R). Alternatively, in some cases (R(3) = CN), the enamine can be utilized for a vinylic sp(2)
A Simple Aliphatic Diamine Auxiliary for Palladium-Catalyzed Arylation of Unactivated <i>β</i>
-C(<i>sp</i>
<sup>3</sup>
)-H Bonds
作者:Jiang Lou、Quannan Wang、Yuan He、Zhengkun Yu
DOI:10.1002/adsc.201801022
日期:2018.12.3
Palladium‐catalyzed β‐C(sp3)‐Harylation of aliphatic acid derivatives was achieved by means of 2‐dimethylaminoethylamine auxiliary as a directing group. The β‐C(sp3)‐Harylation reactions with aryl and heteroaryl iodides efficiently afforded the corresponding arylated hydrocinnamic acid derivatives. Direct β‐C(sp3)‐H alkynylation, and arene C−H arylation and alkynylation were also realized under the
Hybridisation of amino-pyrimidine based SYK inhibitors (e.g. 1a) with previously reported diamine-based SYK inhibitors (e.g. TAK-659) led to the identification and optimisation of a novel pyrimidine-based series of potent and selective SYK inhibitors, where the original aminomethylene group was replaced by a 3,4-diaminotetrahydropyran group. The initial compound 5 achieved excellent SYK potency. However
作者:Samantha A. Green、Jeishla L. M. Matos、Akiko Yagi、Ryan A. Shenvi
DOI:10.1021/jacs.6b08507
日期:2016.10.5
A combination of cobalt and nickel catalytic cycles enables a highly branch-selective (Markovnikov) olefin hydroarylation. Radical cyclization and ring scission experiments are consistent with hydrogenatomtransfer (HAT) generation of a carbon-centered radical that leads to engagement of a nickel cycle.
reaction shows good substrate scope and tolerates a wide range of functionalities in both azoles and sodium sulfinate substrates. Pyrazoles are also suitable for this method, various 4-halopyrazoles derivatives were obtained by using N-halosuccinimide (NXS) as the halogen source.