Rhodium-Catalyzed Synthesis of 2,5-Epoxybenzo[<i>f</i>][1,4]oxazepines by Tandem Reaction of 1-Sulfonyl-1,2,3-triazoles and Salicylaldehydes
作者:Yinping Shi、Xing Yu、Chuan-Ying Li
DOI:10.1002/ejoc.201500912
日期:2015.9
Readily available 1-sulfonyl-1,2,3-triazoles were converted into α-imino carbenes in the presence of catalytic amounts of rhodium(II) salts. The carbenes underwent a tandemreaction with salicylaldehydes to provide a series of functionalized 2,5-epoxybenzo[f][1,4]oxazepines in high yields.
在催化量的铑 (II) 盐的存在下,容易获得的 1-磺酰基-1,2,3-三唑被转化为 α-亚氨基卡宾。卡宾与水杨醛发生串联反应,以高产率提供一系列功能化的 2,5-环氧苯并 [f][1,4] 氧氮杂。
Cu2O acting as a robust catalyst in CuAAC reactions: water is the required medium
作者:Kai Wang、Xihe Bi、Shuangxi Xing、Peiqiu Liao、Zhongxue Fang、Xianyu Meng、Qian Zhang、Qun Liu、Yu Ji
DOI:10.1039/c0gc00848f
日期:——
Cu2O as the catalyst in water was found to be quite robust for the azide-alkyne cycloaddition (AAC) reaction, which was verified by a wide variety of applicable azides and alkynes. Water was proved to play an essential role because of a significant rate acceleration compared with reactions using organic solvents and conducted under neat conditions. The high catalytic performance of Cu2O/H2O system was further argued by decreasing the catalyst loading to ppm levels.
Contractions of 1,4-Diazepines to Pyrroles Triggered by Valence Tautomerization: A One-Pot Approach and Mechanism
作者:Ju Young Lee、Srinivas Samala、Jiyoung Kim、Eun Jeong Yoo
DOI:10.1021/acs.orglett.1c03549
日期:2021.11.19
Herein, we describe the valencetautomerizations of fused 1,4-diazepines, which are reconstructed to give pyrrole derivatives and HCN gas. Several factors that influence the equilibrium between each valence tautomer of an 8π-electron diazepine skeleton are demonstrated. On the basis of these mechanistic studies, a cascade strategy for the construction of diazepines followed by ring contraction is developed
在这里,我们描述了稠合的 1,4-二氮杂卓的价互变异构,它们被重构以产生吡咯衍生物和 HCN 气体。证明了影响 8π 电子二氮杂卓骨架的每个价互变异构体之间平衡的几个因素。在这些机理研究的基础上,开发了一种用于构建二氮杂卓然后进行环收缩的级联策略,以提供芳基或烷基取代的吡咯并[1,2- a ]喹啉,否则这些化合物的制备具有挑战性。此外,所得产品的进一步转化突出了所开发方法的优势。
Rh-Catalyzed Denitrogenative Reaction of<i>N</i>-Sulfonyl-1,2,3-triazoles with Isatoic Anhydrides and Oxadiazolones
作者:Kuntal Pal、Abdul Hoque、Chandra M. R. Volla
DOI:10.1002/chem.201705036
日期:2018.2.21
synthesis of biologically interesting 2‐amino‐benzoxazinones and 5‐amino‐oxadiazoles from readily available isatoicanhydrides and oxadiazolones has been developed. These reactions proceed via an O−H insertion onto α‐imino RhII–carbenoid species followed by a rearrangement. The scope of the reaction can also be extended to benzoxazinones to access amino‐substituted benzoxazines.
Rhodium(<scp>ii</scp>)-catalyzed synthesis of 2-aminoquinoline derivatives from 2-quinolones and <i>N</i>-sulfonyl-1,2,3-triazoles
作者:Nilesh M. Kahar、Pankaj P. Jadhav、Sudam G. Dawande
DOI:10.1039/d3ob00971h
日期:——
Herein, we disclose a rhodium(II) catalyzed efficient and convenient method for the synthesis of 2-aminoquinoline derivatives from 2-quinolones and N-sulfonyl-1,2,3-triazoles. The reaction provides rapid access to a series of 2-aminoquinolines with moderate to excellent yields. The reaction proceeds via quinolone–hydroxyquinoline tautomerization/O–H insertion to a rhodium(II)-aza vinyl carbene intermediate
在此,我们公开了一种铑( II )催化的由2-喹诺酮类和N-磺酰基-1,2,3-三唑合成2-氨基喹啉衍生物的高效且便捷的方法。该反应可以快速获得一系列 2-氨基喹啉,产率中等至优异。该反应通过喹诺酮-羟基喹啉互变异构/O-H插入到铑( II )-氮杂乙烯基卡宾中间体中进行,该中间体是通过三唑脱氮产生的,然后重排以产生所需的产物。此外,我们还证明了碘介导的 2-氨基喹啉衍生物的脱烷基化。