Cobalt-Catalyzed CH Arylations with Weakly-Coordinating Amides and Tetrazoles: Expedient Route to Angiotensin-II-Receptor Blockers
作者:Jie Li、Lutz Ackermann
DOI:10.1002/chem.201500552
日期:2015.4.7
Cobalt‐catalyzed CH arylations enabled the synthesis of biaryl tetrazoles, which are key structural motifs in antihypertensive angiotensin‐II‐receptor blockers. Thus, weakly‐coordinating benzamides were employed for step‐economical CH arylations with ample scope. Further, a low‐valent NHC complex enabled first cobalt‐catalyzed CH functionalization by tetrazole assistance.
Is Fe-catalyzed <i>ortho</i> C–H Arylation of Benzamides Sensitive to Steric Hindrance and Directing Group?
作者:Yi-Ming Wei、Meng-Fei Wang、Xin-Fang Duan
DOI:10.1021/acs.orglett.9b02359
日期:2019.8.16
The previously reported Fe-catalyzed ortho C–H arylation of benzamides relied on bi- or tridentate amide groups and specific iron ligands and was sensitive to steric hindrance. By using new mixed titanates, our present protocol accommodates various weakly coordinating benzamides and tolerates high steric hindrance and sensitive functional groups only under the catalysis of FeCl3 and TMEDA. A wide range
Nickel-Catalyzed Cross-Electrophile Coupling of 1,2,3-Benzotriazin-4(3<i>H</i>)-ones with Aryl Bromides
作者:Tingzhi Lin、Yan-En Wang、Ning Cui、Miaohui Li、Rui Wang、Jiahui Bai、YiRan Fan、Dan Xiong、Fei Xue、Patrick J. Walsh、Jianyou Mao
DOI:10.1021/acs.joc.2c02246
日期:2022.12.16
The nickel-catalyzed cross-electrophile coupling of 1,2,3-benzotriazin-4(3H)-ones with arylbromides to generate a diverse array of ortho-arylated benzamide derivatives has been developed. The reaction displayed good functional group tolerance with Zn as the reductant. The key to this transformation is the ring opening of benzotriazinones, which undergo a denitrogenative process to obtain various benzamide
已经开发了镍催化的 1,2,3-苯并三嗪-4(3 H )-与芳基溴的交叉亲电子偶联,以生成多种邻芳基化苯甲酰胺衍生物。该反应以 Zn 作为还原剂显示出良好的官能团耐受性。这种转化的关键是苯并三嗪酮的开环,它经过脱氮过程以获得各种苯甲酰胺衍生物(29 个例子,42-93% 产率)。证明了这种转变的可扩展性。
Fe-Catalyzed Difunctionalization of Aryl Titanates Enabled by Fe/Ti Synergism
Fe-catalyzed difunctionalization of aryl titanates via double C–H activation has been developed, where aryl titanates were arylated via ortho C–H activation, followed by ipso electrophilic trapping of the C–Ti bond. The ortho C–H arylation should be promoted by a 1,2-Fe/Ti synergistic heterobimetallic arylene intermediate and represents an ortho C–H ferration directed by a readily transformable C–Ti group