A direct and catalytic method is reported here for β‐arylation of N‐protected lactams with simple aryl iodides. The transformation is enabled by merging soft enolization of lactams, palladium‐catalyzed desaturation, Ar−X bond activation, and aryl conjugate addition. The reaction is operated under mild reaction conditions, is scalable, and is chemoselective. Application of this method to concise syntheses
Synthesis of Lactams via Ir-Catalyzed C–H Amidation Involving Ir-Nitrene Intermediates
作者:Jitian Liu、Wenjing Ye、Shuojin Wang、Junrong Zheng、Weiping Tang、Xiaoxun Li
DOI:10.1021/acs.joc.0c00157
日期:2020.3.20
We have developed a divergent strategy for the synthesis of five- and six-membered lactams via either an amidation of sp3 C-H bonds or electrophilic substitution of arenes via Ir-nitrene intermediates. With the employment of a readily available iridium catalyst in dichloromethane or hexafluoro-2-propanol, a wide range of lactams were synthesized in good to excellent yields with high selectivity.
Benzofused lactams, especially indolin‐2‐one and dihydroquinolin‐2‐one are popular structural motives in durgs and natural products. Herein, we developed a room temperature and robust synthesis of benzofused lactams through cobalt(III)‐catalyzed C(sp2)−H amidation. In this protocol, in‐situ formation of Cp*Co(III)(ligand) catalyst from Cp*Co(CO)I2 and ligand simplify the synthetic effort of cobalt
mechanochemical approach towards 3,4-dihydro-2(1H)-quinolinones by catalysis with FeBr3 has been developed. The solvent-free processes start from readily available dioxazolones, which undergo intramolecularamidation reactions providing the products in good to very high yields. Practically, the reactions are easy to perform, proceed within a short period of time and require only standard ball milling equipment
开发了一种通过 FeBr 3催化制备 3,4-二氢-2(1 H )-喹啉酮的机械化学方法。无溶剂工艺从容易获得的二恶唑酮开始,它经历分子内酰胺化反应,以良好到非常高的产率提供产品。实际上,反应很容易进行,在短时间内进行,并且只需要标准的球磨设备。
Nitrenium ion-based ipso-addition and ortho-cyclization of arenes under photo and iron dual-catalysis
developed as an efficient acyl nitrenium ion precursor. An iron-catalyzed acyl nitrenium-based ipso-addition and ortho-cyclization of arenes under photocatalysis is reported for the switchable synthesis of 3,4-dihydroquinolin-2-ones and 6,9-diene-2,8-diones. In the reaction, FeCl3 serves as the photocatalyst and SET reductant, and an acyl nitrenium ion was proposed as a key intermediate. It is assumed that
在这项工作中,N-酰氧基苯甲酰胺被开发为一种高效的酰基氮鎓离子前体。报道了在光催化下基于铁催化的酰基硝基的ipso加成和芳烃的邻位环化,用于可转换地合成 3,4-dihydroquinolin-2-one 和 6,9-diene-2,8-diones。在该反应中,FeCl 3作为光催化剂和 SET 还原剂,提出了一个酰基氮鎓离子作为关键中间体。假设 ipso 加成和邻环化的差异是由底物上的取代基实现的。对位取代芳烃的反应主要通过ipso加成和 CC迁移,而间位取代芳烃的迁移通过邻环化进行。