Copper-Catalyzed Remote C(sp<sup>3</sup>)–H Amination of Carboxamides
作者:Qing-Qiang Min、Jia-Wen Yang、Meng-Juan Pang、Gui-Zhen Ao、Feng Liu
DOI:10.1021/acs.orglett.0c00829
日期:2020.4.3
Here we report a method for the site-selective intermolecular C(sp3)–H amination of carboxamides by merging transition-metal catalysis and the hydrogen atom transfer strategy. The reaction proceeds through a sequence of favorable single-electron transfer, 1,5-hydrogen atom transfer, and C–N cross-coupling steps, thus allowing access to a series of desired products. This reaction could accommodate a
The catalyticC(sp3)-H functionalization is highly desirable yet challenging in organic synthesis. Incorporation of the SP(O)(OR)2 group through C(sp3)-H functionalization remains unexplored. We herein report an unprecedented protocol for phosphorothiolation of primary and secondary C(sp3)-H via a multicomponent reaction with N-fluoro-substituted amides, elemental sulfur, and P(O)H compounds involving
作者:Brian J. Groendyke、Deyaa I. AbuSalim、Silas P. Cook
DOI:10.1021/jacs.6b08171
日期:2016.10.5
This communication describes a mild, amide-directed fluorination of benzylic, allylic, and unactivated C-H bonds mediated by iron. Upon exposure to a catalytic amount of iron(II) triflate (Fe(OTf)2), N-fluoro-2-methylbenzamides undergo chemoselective fluorine transfer to provide the corresponding fluorides in high yield. The reaction demonstrates broad substrate scope and functional group tolerance
该通讯描述了由铁介导的苄基、烯丙基和未活化的 CH 键的温和、酰胺导向氟化。在接触催化量的三氟甲磺酸铁 (II) (Fe(OTf)2) 后,N-氟-2-甲基苯甲酰胺进行化学选择性氟转移,以高产率提供相应的氟化物。该反应显示出广泛的底物范围和官能团耐受性,无需使用任何贵金属添加剂。机理和计算实验表明,反应通过短寿命的自由基中间体进行,F-转移直接由铁介导。
Pyrrolidinone-fused Cyclohexenones by Regioselective Dearomatising Anionic Cyclisation of 2-, 3- or 4-Methoxybenzamides
作者:Jonathan Clayden、Kirill Tchabanenko、Samreen A. Yasin、Michael D. Turnbull
DOI:10.1055/s-2001-10772
日期:——
4-MeOC6H4), cyclized with dearomatization to give Me dienylethers, e.g. II, which were hydrolyzed with dil. HCl to give single stereo- and regioisomers of pyrrolidine-fused cyclohexenones, e.g. III. The bicyclic enones are versatile synthetic intermediates which undergo transformations such as stereoselective redn. and conjugate addn., regioselective Baeyer-Villiger oxidn., bromination and hydrogenation
Phenyl Compounds and Their Use in the Treatment of Type II Diabetes
申请人:Blaszczak Larry Chris
公开号:US20080221217A1
公开(公告)日:2008-09-11
The present invention is directed to compounds of formula (I) or a pharmaceutically acceptable salt thereof; wherein A is (xx); X is selected from CH, CF and N, R5 is selected from H, C
1
-C
6
alkyl, C
1
-C
6
fluoroalkyl, and —OR12, R9 is selected from H and —C(O)NR1OR11, R12 is selected from H, C
1
-C
6
alkyl and C
3
-C
6
cycloalkyl for use as inhibitors of the DPP-IV enzyme in the treatment or prevention of conditions including Type II diabetes.