Biaryl and heteroaryl derivatives of SCH 58261 as potent and selective adenosine A2A receptor antagonists
摘要:
SCH 58261 is a reported adenosine A(2A) receptor antagonist, which is active in rat in vivo models of Parkinson's Disease upon ip administration. However, it has poor selectivity versus the A(1) receptor and does not demonstrate oral activity. We report the design and synthesis of biaryl and heteroaryl analogs of SCH 58261 which improve the A(2A) receptor binding selectivity as well as the pharmacokinetic properties of SCH 58261. In particular, the quinoline 25 has excellent A(2A) receptor in vitro binding affinity and selectivity, sustained rat plasma levels upon oral dosing, and is active orally in a rat behavioral assay. (C) 2008 Elsevier Ltd. All rights reserved.
mild visible light-induced palladium-catalyzed alkyl Heckreaction of diazo compounds and N-tosylhydrazones is reported. This method features Brønsted acid assisted generation of hybrid palladium C(sp3)-centered radical intermediate and broad reaction scope, highlighting the diverse applicability and the potential utility of this protocol in late-stage functionalization.
Three-Component Visible-Light-Induced Palladium-Catalyzed 1,2-Alkyl Carbamoylation/Cyanation of Alkenes
作者:Xiangqing Jia、Ziyan Zhang、Vladimir Gevorgyan
DOI:10.1021/acscatal.1c04183
日期:2021.11.5
three-component alkyl-carbamoylation and cyanation of alkenes was developed. This general transformation, which proceeds via the in situ formation of a reactive ketenimine intermediate, allows for a rapid construction of a broad range of valuable amides and nitriles from readily available alkenes, alkyl iodides, and isocyanides. An efficient synthesis of tetrazole and amidine via this approach was also
Dual electrocatalysis enables enantioselective hydrocyanation of conjugated alkenes
作者:Lu Song、Niankai Fu、Brian G. Ernst、Wai Hang Lee、Michael O. Frederick、Robert A. DiStasio、Song Lin
DOI:10.1038/s41557-020-0469-5
日期:2020.8
Chiralnitriles and their derivatives are prevalent in pharmaceuticals and bioactive compounds. Enantioselective alkene hydrocyanation represents a convenient and efficient approach for synthesizing these molecules. However, a generally applicable method featuring a broad substrate scope and high functional group tolerance remains elusive. Here, we address this long-standing synthetic problem using
Transition-metal-free regioselective synthesis of alkylboronates from arylacetylenes and vinyl arenes
作者:Kai Yang、Qiuling Song
DOI:10.1039/c5gc02633d
日期:——
A transition-metal-free synthesis of alkylboronates from arylacetylenes or vinyl arenes and B2pin2via tandem borylation and protodeboronation has been developed. This reaction features with excellent regioselectivities, broad functional group tolerance and good yields in both small and gram scale.
Nickel-Catalyzed Reductive Cross-Coupling of Aryl Bromides with Vinyl Acetate in Dimethyl Isosorbide as a Sustainable Solvent
作者:Mincong Su、Xia Huang、Chuanhu Lei、Jian Jin
DOI:10.1021/acs.orglett.1c04018
日期:2022.1.14
nickel-catalyzed reductive cross-coupling has been achieved using (hetero)arylbromides and vinyl acetate as the coupling partners. This mild, applicable method provides a reliable access to a variety of vinyl arenes, heteroarenes, and benzoheterocycles, which should expand the chemical space of precursors to fine chemicals and polymers. Importantly, a sustainable solvent, dimethyl isosorbide, is used