Palladium-catalyzed aminocarbonylation of halo-substituted 7-azaindoles and other heteroarenes using chloroform as a carbon monoxide source
作者:Prakash Kannaboina、Gaurav Raina、K. Anil Kumar、Parthasarathi Das
DOI:10.1039/c7cc04339b
日期:——
A palladium-catalyzed aminocarbonylation of halo-substituted 7-azaindoles utilizing CHCl3 as the carbonyl source has been developed for the straightforward incorporation of an amide functional group. The protocol was extended to other heteroarenes such as pyrazolopyridines and indazoles. The substrate scope of the reaction with respect to heteroarenes and the amine component is reported. This method
Compounds of the formula (I) in which R, R
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Control of Redox‐Active Ester Reactivity Enables a General Cross‐Electrophile Approach to Access Arylated Strained Rings**
作者:Daniel C. Salgueiro、Benjamin K. Chi、Ilia A. Guzei、Pablo García‐Reynaga、Daniel J. Weix
DOI:10.1002/anie.202205673
日期:2022.8.15
Aliphatic strained rings can be (hetero)arylated through a decarboxylative cross-electrophile coupling. The keys to this advance are: 1) a new ligand that enables tolerance of a variety of strained ring classes and 2) electronic tunability of redox-active esters to control the rate of radical generation.
Carbonylative Transformations Using a DMAP-Based Pd-Catalyst through Ex Situ CO Generation
作者:Pallabi Halder、Ashif Iqubal、Krishanu Mondal、Narottam Mukhopadhyay、Parthasarathi Das
DOI:10.1021/acs.joc.3c01725
日期:2023.11.3
aminocarbonylation and carbonylative Suzuki–Miyaura coupling has been developed using a novel palladium complex, [PdII(DMAP)2(OAc)2]. The complex was successfully synthesized using a stoichiometric reaction between PdII(OAc)2 and DMAP in acetone at room temperature and characterized using single-crystal X-ray analysis. Only 5 mol % catalyst loading was sufficient for effective carbonylativetransformations. “Chloroform-COware”
使用新型钯配合物[Pd II (DMAP) 2 (OAc) 2 ]开发了一种无膦、高效的氨基羰基化和羰基化Suzuki-Miyaura偶联方案。该复合物是在室温下在丙酮中通过 Pd II (OAc) 2和 DMAP之间的化学计量反应成功合成的,并使用单晶 X 射线分析进行了表征。仅 5 mol% 的催化剂负载量就足以实现有效的羰基化转化。利用“氯仿-COware”化学方法,在两室装置中使用氯仿作为廉价的 CO 源,安全、轻松地插入羰基单元。利用该技术合成了CX-516、CX-546、farampator等多种增值药学相关化合物。此外,商业设计的 COware 被设计为 COware-RB 设置,用于连续一锅合成茚并异喹啉(拓扑异构酶 I 抑制剂)。
I<sub>2</sub>/CAN as a Mild and Efficient Reagent for Oxidative Csp<sup>3</sup>‐Csp<sup>2</sup> Cleavage of 3,3′‐Bis‐7‐azaindolylmethane: A Rapid One‐Pot Access to 3‐Formyl and 3‐Iodo‐7‐azaindoles
The combination of I2/CAN emerged as a mild and efficient reagent for oxidative Csp3-Csp2 cleavage of 3,3’-bis-7-azaindolylmethanes. The one-pot cleavage reaction affords 3-formyl and 3-iodo-7-azaindoles in an excellent combined yield. Based on the control experiments and literature, a plausible mechanism is postulated. Synthetic transformation of the products has also been described.