unprecedented [4 + 2] annulation reaction between in situ formed azoalkenes and azlactones has been developed. This reaction provides a facile access to an array of 4,5-dihydropyridazin-3(2H)-one derivatives, which are very promising in medicinal applications as potential biologically active candidates. Notably, these dihydropyridazinones could also be synthesized via a one-potreaction protocol by using the
Electrocarboxylation of <i>N</i>-Acylimines with Carbon Dioxide: Access to Substituted α-Amino Acids
作者:Ke Zhang、Xiao-Fei Liu、Wen-Zhen Zhang、Wei-Min Ren、Xiao-Bing Lu
DOI:10.1021/acs.orglett.2c01267
日期:2022.5.20
Direct electrocarboxylation of various N-acylimines with atmospheric CO2 is achieved in an undivided cell under mild conditions, affording substituted α-amino acids in yields of 62–95%. This reaction is conducted with high efficiency using triethanolamine as an external reductant under nonsacrificial anode conditions, and can be facilely performed on gram scale. Preliminary mechanistic studies including
各种N-酰基亚胺与大气 CO 2的直接电羧化是在温和条件下在未分裂的电池中实现的,以 62-95% 的产率提供取代的 α-氨基酸。该反应在非牺牲阳极条件下使用三乙醇胺作为外部还原剂高效进行,并且可以轻松地以克级进行。包括循环伏安法和对照实验在内的初步机理研究支持N自由基碳负离子作为关键中间体。
Lawesson's reagent promoted deoxygenation of azlactones for the syntheses of 2,4-disubstituted thiazoles
作者:Gaofeng Yin、Xiaodong Wang、Yuqing Wang、Tao Shi、Yaofu Zeng、Yuying Wang、Xue Peng、Zhen Wang
DOI:10.1039/d2ob01939f
日期:——
Azlactones and thiazoles are common structural motifs and possess diverse applications. A new method for the efficient and straightforward syntheses of 2,4-disubstituted thiazoles from azlactones has been developed. The reaction proceeded via deoxygenation of azlactones by Lawesson's reagent without metal or external additives. A variety of 2,4-disubstituted thiazoles were synthesized with up to 92%
Benzotetramisole-Catalyzed Dynamic Kinetic Resolution of Azlactones
作者:Xing Yang、Guojian Lu、Vladimir B. Birman
DOI:10.1021/ol902969j
日期:2010.2.19
Enantioselective acyl transfer catalyst benzotetramisole (BTM) has been found to promote dynamic kinetic resolution of azlactones providing di(1-naphthyl)methyl esters of alpha-amino acids with up to 96% ee.