Metal-Free Synthesis of C-4 Substituted Pyridine Derivatives Using Pyridine-boryl Radicals via a Radical Addition/Coupling Mechanism: A Combined Computational and Experimental Study
作者:Guoqiang Wang、Jia Cao、Liuzhou Gao、Wenxin Chen、Wenhao Huang、Xu Cheng、Shuhua Li
DOI:10.1021/jacs.7b00823
日期:2017.3.15
that the pyridine-boryl radical generated in situ using 4-cyanopyridine and bis(pinacolato)diboron could be used as a bifunctional "reagent", which serves as not only a pyridine precursor but also a borylradical. With the unique reactivity of such radicals, 4-substituted pyridine derivatives could be synthesized usingα,β-unsaturated ketones and 4-cyanopyridine via a novel radical addition/C-C coupling
3-,4-Pyridyl and 4-quinolyl Grignardreagents were generated by the reaction of the corresponding phenyl sulfoxides with PhMgBr and give the adducts upon treatment with various aldehydes and ketones. The stereochemistry for the reaction was investigated.
Synthesis of Dihydropyridine Spirocycles by Semi-Pinacol-Driven Dearomatization of Pyridines
作者:Joseph C. Abell、Christian P. Bold、Laia Vicens、Tom Jentsch、Noelia Velasco、Jasper L. Tyler、Robert N. Straker、Adam Noble、Varinder K. Aggarwal
DOI:10.1021/acs.orglett.2c04095
日期:2023.1.20
routine incorporation of these highly rigid and three-dimensional structures in pharmaceuticals. Herein, we report an operationally simple synthesis of spirocyclic dihydropyridines via an electrophile-induced dearomative semi-pinacol rearrangement of 4-(1′-hydroxycyclobutyl)pyridines. The various points for diversification of the spirocyclization precursors, as well as the synthetic utility of the amine
Deconstructive Cyanomethylation Enabled by Radical Cross‐Coupling through Multiple C−C Bond and C−H Bond Cleavage
作者:Changzhen Yin、Wei Liu、Qiang Wu、Miao Wang、Peng Hu
DOI:10.1002/adsc.202300183
日期:——
ketones. Notably, the highly challenging reaction involves twice C−C single bondcleavage through β-scission of alkoxyl radical intermediates, and twice C(sp3)−H bond transformation via hydrogen atom transfer (HAT) procedures, resulting in two carbon radical species that realize a radical cross-coupling process to form a new C(sp3)−C(sp3) bond selectively. α-arylketo and α-aryl substituted tertiary alcohols