已经开发了钯催化的好氧氧化C–H硝化和芳烃与简单易用的亚硝酸叔丁酯(TBN)和甲苯作为自由基前体的酰化反应。分子氧被用作末端氧化剂和氧源以引发活性自由基反应物。在这些新颖的转化中可以使用许多不同的导向基团,例如吡啶,嘧啶,吡唑,吡啶醇,吡啶基酮,肟和偶氮基团。通过自由基过程的Pd II / Pd IV催化循环是这些氧化的CH–H硝化和酰化反应的最可能途径。
Copper-Mediated Chelation-Assisted <i>Ortho</i> Nitration of (Hetero)arenes
作者:Lin Zhang、Zhenhua Liu、Huiqin Li、Guichun Fang、Badru-Deen Barry、Tuemay Abadi Belay、Xihe Bi、Qun Liu
DOI:10.1021/ol2028288
日期:2011.12.16
A novel copper-mediated chelation-assisted ortho C–H nitration of (hetero)arenes has been developed for the first time, which used dioxygen as terminal oxidant and 1,2,3-TCP as solvent, leading to the synthesis of nitroaromatics with excellent regioselectivity and in good yields. Mechanistic investigations indicate a mechanism involving a four-centered transition state, with simultaneous cleavage of
Rhodium(III)-Catalyzed Azidation and Nitration of Arenes by CH Activation
作者:Fang Xie、Zisong Qi、Xingwei Li
DOI:10.1002/anie.201305902
日期:2013.11.4
nitrite served as readily available nitrogen sources, and pyridine, pyrimidine, and pyrazole substituents were efficient directing groups (DGs; see scheme; Cp*=C5Me5). The synthetic utility of the azidation products was demonstrated in subsequent functional‐group transformations.
掌握解决方案:在存在高价碘氧化剂的螯合辅助标题反应中,叠氮化钠和亚硝酸钠是易于获得的氮源,吡啶,嘧啶和吡唑取代基是有效的导向基团(DG;参见方案; Cp * = C 5 Me 5)。叠氮化产物的综合效用在随后的功能组转化中得到了证明。
Messmer, A.; Hajos, Gy.; Giber, J., Journal of Heterocyclic Chemistry, 1987, vol. 24, p. 1133 - 1135
作者:Messmer, A.、Hajos, Gy.、Giber, J.、Holly, S.
DOI:——
日期:——
MESSMER, A.;HAJOS, GY.;GIBER, J.;HOLLY, S., J. HETEROCYCL. CHEM., 24,(1987) N 4, 1133-1135
作者:MESSMER, A.、HAJOS, GY.、GIBER, J.、HOLLY, S.
DOI:——
日期:——
Synthesis and Antiarrhythmic Activity of Disubstituted Phenylpyridine Derivative.
disubstituted phenylpyridine derivatives was synthesized and their antiarrhythmic effects against chloroform-induced ventricular arrhythmias in mice were examined. Among them, 2- and 3-[2-(3-aminobutyramido)-4-(2,2,2-trifluroethoxy)phenyl]pyri dines (23h, 24h) and 3-[2-(3-aminobutyramido)-4-ethoxyphenyl]pyridine (24i) showed potent antiarrhythmicactivity. They had approximately twice the potency of mexiletine