Possible competitive modes of decarboxylation in the annulation reactions of <i>ortho</i>-substituted anilines and arylglyoxylates
作者:Joydev K. Laha、Surabhi Panday、Monika Tomar、Ketul V. Patel
DOI:10.1039/d0ob00360c
日期:——
iminocarboxylic acids has been postulated. Given the subtle understanding of the mechanisms of annulation reactions of 2-substituted anilines and arylglyoxylates in the presence of K2S2O8, an extensive mechanistic investigation was undertaken. In the current study, the various mechanistic pathways including the generation of acyl, imidoyl, aminal, and N,O-hemiketal radicals have been postulated based on different
研究了在无金属中性条件下在80°C下在K 2 S 2 O 8存在下邻位取代的苯胺和芳基乙醛酸酯的环化反应,这为氮杂环的串联合成提供了平台。尽管已知芳基乙醛酸在K 2 S 2 O 8存在下会发生脱羧反应,形成一个酰基基团,并用于缺电子(杂)芳烃的Minisci酰化反应,但它们与富电子邻位的反应最近已经研究了取代苯胺形成氮杂环的方法。根据反应中使用的实验条件,已经提出了涉及酰基或芳基亚氨基羧酸反应的杂环形成机理。在存在K 2 S 2 O 8的情况下,对2-取代苯胺和芳基乙醛酸酯的环化反应机理有较深入的了解进行了广泛的机械研究。在当前的研究中,已经基于不同的可能的脱羧模式推测了各种机理途径,包括酰基,亚氨基,氨基和N,O-半缩酮的生成。基于可用的分析数据,可以支持某些建议的中间体。该协议使用一种廉价的单一试剂K 2 S 2 O 8,该试剂不仅提供了无过渡金属的条件,而且还用作关键的脱羧步骤的试剂
Iron-Catalyzed Oxidative Coupling of Indoline-2-ones with Aminobenzamides via Dual C–H Functionalization
We describe an unprecedented dual C-H functionalization of indolin-2-one via an oxidative C(sp3)-H/N-H/X-H (X = N, C, S) cross-coupling protocol, which is catalyzed by a simple iron salt under mild and ligand-free conditions and employs air (molecular oxygen) as the terminal oxidant. This method is readily applicable for the construction of tetrasubstituted carbon centers from methylenes and provides
tert-Butyl Peroxybenzoate Mediated Selective and Mild N-Benzoylation of Ammonia/Amines under Catalyst- and Solvent-Free Conditions
作者:Bhalchandra Bhanage、Dilip Yadav
DOI:10.1055/s-0034-1380811
日期:——
A newprotocol for the synthesis of amides from tert-butyl peroxybenzoate (TBPB) and ammonia/amines has been developed under catalyst- and solvent-free conditions. The ammonia, primary and secondary amines reacted smoothly with TBPB to furnish the corresponding primary, secondary, and tertiary amides in excellent yields. TBPB proved to be an efficient and highly chemoselective benzoylating reagent
An azobenzene-containing metal–organic framework as an efficient heterogeneous catalyst for direct amidation of benzoic acids: synthesis of bioactive compounds
作者:Linh T. M. Hoang、Long H. Ngo、Ha L. Nguyen、Hanh T. H. Nguyen、Chung K. Nguyen、Binh T. Nguyen、Quang T. Ton、Hong K. D. Nguyen、Kyle E. Cordova、Thanh Truong
DOI:10.1039/c5cc05985b
日期:——
An Zr-MOFs was demonstrated to be an efficient heterogeneous catalyst for direct amidation.
一种Zr-MOFs被证明是一种高效的直接酰胺化的杂化催化剂。
A convenient palladium-catalyzed carbonylative synthesis of quinazolines from 2-aminobenzylamine and aryl bromides
A novel and practical strategy towards quinazoline scaffolds synthesis has been achieved. Through palladium-catalyzedcarbonylative coupling of 2-aminobenzylamine with arylbromides, the desired quinazolines were produced in moderate to good yields for the first time. The reactions followed an aminocarbonylation–condensation–oxidation sequence in a one-pot one-step manner. Preliminary investigation