3-烷基(芳基甲基)氨基-2-重氮-3-氧代丙酸乙酯(重氮酰胺基乙酸酯)通常同时生成环庚[ c ]吡咯烷酮(Buchner产物)和β-内酰胺(1,4-插入产物),并显示出明显的N-铜盐催化下分子内布氏反应与脂肪族1,4-CH插入之间的取代基控制的化学选择性。酰胺部分中较少的空间N-烷基取代基通常有利于脂肪族1,4-CH插入,而较高的空间N-烷基取代基通常有利于布氏反应。与铑和钌催化的条件相比,当前的铜催化条件提高了3-烷基(芳基甲基)氨基-2-重氮-3-氧代丙酸乙酯的布氏反应选择性。
3-烷基(芳基甲基)氨基-2-重氮-3-氧代丙酸乙酯(重氮酰胺基乙酸酯)通常同时生成环庚[ c ]吡咯烷酮(Buchner产物)和β-内酰胺(1,4-插入产物),并显示出明显的N-铜盐催化下分子内布氏反应与脂肪族1,4-CH插入之间的取代基控制的化学选择性。酰胺部分中较少的空间N-烷基取代基通常有利于脂肪族1,4-CH插入,而较高的空间N-烷基取代基通常有利于布氏反应。与铑和钌催化的条件相比,当前的铜催化条件提高了3-烷基(芳基甲基)氨基-2-重氮-3-氧代丙酸乙酯的布氏反应选择性。
Exploiting Continuous Processing for Challenging Diazo Transfer and Telescoped Copper-Catalyzed Asymmetric Transformations
作者:Daniel C. Crowley、Thomas A. Brouder、Aoife M. Kearney、Denis Lynch、Alan Ford、Stuart G. Collins、Anita R. Maguire
DOI:10.1021/acs.joc.1c01310
日期:2021.10.15
Generation and use of triflyl azide in flow enables efficient synthesis of a range of α-diazocarbonyl compounds, including α-diazoketones, α-diazoamides, and an α-diazosulfonyl ester, via both Regitz-type diazo transfer and deacylative/debenzoylative diazo-transfer processes with excellent yields and offers versatility in the solvent employed, in addition to addressing the hazards associated with handling
Electrochemical electrophilic bromination/spirocyclization of N-benzyl-acrylamides to brominated 2-azaspiro[4.5]decanes
作者:Zhongyi Zhang、Zhong-Wei Hou、Hao Chen、Pinhua Li、Lei Wang
DOI:10.1039/d3gc00728f
日期:——
An electrochemical electrophilic bromination/spirocyclization of N-benzyl-acrylamides with 2-bromoethan-1-ol as the brominating reagent has been developed. The paired electrolysis employs low concentrations of bromine produced from both cathodic reduction and anodic oxidation as an electrophile, and realizes an H2O-involved electrophilic spirocyclization. A number of unexplored brominated 2-azaspiro[4