P<sup>III</sup>
-Chelation-Assisted Indole C7-Arylation, Olefination, Methylation, and Acylation with Carboxylic Acids/Anhydrides by Rhodium Catalysis
作者:Xiaodong Qiu、Panpan Wang、Dingyi Wang、Minyan Wang、Yu Yuan、Zhuangzhi Shi
DOI:10.1002/anie.201813182
日期:2019.1.28
olefination, and methylation of indoles with carboxylic acids or anhydrides by C−H and C−C bond activation have been developed. Furthermore, C7‐acylation products can also be generated selectively at a lower reaction temperature in the developed system. The key to the high reactivity and regioselectivity of this transformation is the appropriate choice of an indole N‐PtBu2 chelation‐assisted group
Nickel-Catalyzed Three-Component Reductive Alkylacylation of Electron-Deficient Activated Alkenes
作者:Lin Wang、Chuan Wang
DOI:10.1021/acs.orglett.0c03210
日期:2020.11.20
alkylacylation of electron-deficient activated alkenes with tertiary alkyl bromides and acid anhydrides. This method enables the efficient preparation of a variety of ketones with broad substrate scope and high functionality tolerance starting from simple precursors. On the basis of the preliminary mechanistic investigations, a catalytic cycle involving the synergistic interaction of nickel, zinc, and MgCl2
Visible-light induced cross-electrophile coupling of imines and anhydrides to synthesize α-amino ketones
作者:Renxu Cao、Yu Liu、Xiaoxin Shi、Jun Zheng
DOI:10.1039/d3cc03028h
日期:——
cross-electrophile coupling of readily available imines and anhydrides was developed. Under mild reaction conditions, the umpolung reactivity of diverse imines engaged with anhydrides gives a variety of α-amino ketones with good yields and a broad functional group compatibility. Primary mechanistic studies revealed that this transformation might proceed through a radical–radicalcrosscoupling pathway dominantly
Base-Mediated Synthesis of Anhydrides from Activated Amides
作者:Iliyasu Aliyu Bashir、Sunwoo Lee
DOI:10.1021/acs.joc.2c03098
日期:2023.5.5
Symmetrical anhydrides were synthesized from activated amides such as N-benzoylsaccharins and N-Boc-protected benzamides. The activated amides reacted with H2O in the presence of 1,4-diazabicyclo[2.2.2]octane (DABCO) at 25 °C to produce the corresponding symmetrical anhydrides in high yields through C–N bond cleavage. In addition, N-benzoylsaccharins reacted with benzoic acid derivatives to generate
对称酸酐由活化的酰胺合成,例如N-苯甲酰糖精和N -Boc-保护的苯甲酰胺。活化的酰胺在 1,4-二氮杂双环 [2.2.2] 辛烷 (DABCO) 存在下于 25 °C 与H 2 O 反应,通过 C-N 键裂解以高产率产生相应的对称酸酐。此外,N-苯甲酰糖精与苯甲酸衍生物反应生成不对称酸酐,产率高。
Synthesis of Aryl Amides from Acyl-Bunte Salts and Aryl Azides
作者:Li-Jia Chen、Chia-Jou Kuo、Chien-Fu Liang
DOI:10.1021/acs.joc.3c00477
日期:2023.8.4
In this study, we developed an efficient method for the synthesis of aryl amides from sodium thiosulfate pentahydrate, organic anhydrides, and aryl azides. Sodium thiosulfate may be used as the sulfur source, which reacts with anhydrides to generate acyl-Bunte salt; this salt reacts with aryl azides via the in situ generation of thiocarboxylate. Using our method, we successfully synthesized a key bioactive