A catalytic, metal-free O–H bondinsertion of α-diazoesters in water in the presence of B(C6F5)3·nH2O (2 mol %) was developed, affording a series of α-hydroxyesters in good to excellent yields. The reaction features easy operation and wide substrate scope, and importantly, no metal is needed as compared with the conventional methods. Significantly, this approach further expands the applications of
在存在B(C 6 F 5)3 · n H 2 O(2摩尔%)的条件下,开发了水中无催化的α-重氮酸酯插入金属的O–H键,从而获得了一系列的α-羟基酯。好到极好的产量。该反应具有易于操作和广泛的底物范围的特点,重要的是,与常规方法相比,不需要金属。重要的是,这种方法进一步扩展了B(C 6 F 5)3在耐水条件下的应用。
Blue Light-Emitting Diode-Mediated <i>In Situ</i> Generation of Pyridinium and Isoquinolinium Ylides from Aryl Diazoesters: Their Application in the Synthesis of Diverse Dihydroindolizine
作者:Saibal Sar、Souvik Guha、Tejas Prabakar、Debajit Maiti、Subhabrata Sen
DOI:10.1021/acs.joc.1c01209
日期:2021.9.3
1/2, aryl diazoesters 3, and acrylic ester/3-alkenyl oxindoles 5/6 provide various dihydroindolizines 7 to 9 in excellent yield. The principle of the strategy is photolytic generation of nitrogen ylidesfrom N-heteroarenes and aryl diazoesters and their subsequent [3 + 2] cycloaddition reaction with dipolarophiles. Detailed mechanistic analysis of the transformation through control experiments establishes
Blue LED-Mediated N–H Insertion of Indoles into Aryldiazoesters at Room Temperature in Batch and Flow: Reaction Kinetics, Density Functional Theory, and Mechanistic Study
作者:Debajit Maiti、Ranajit Das、Subhabrata Sen
DOI:10.1021/acs.joc.0c02649
日期:2021.2.5
blue light-mediated N–H insertion of indole and its derivatives into aryldiazoesters has been reported in a batch and flow strategy to afford the corresponding N-alkylated product in moderate-to-excellent yield. Detailed high-performance liquid chromatography-based reaction kinetics measurements, control experiments, and kinetic isotope effect reveal that 3-substitutedindoles with electron-withdrawing
An efficient copper-catalyzedcarbenoidinsertion reaction of α-diazo carbonyl compounds into Si–H and S–H bonds was developed. A wide range of α-silylesters and α-thioesters was obtained in high yields (up to 98%) from α-diazoesters using 5 mol% of a simple copper(I) salt as catalyst. Using 0.05 mol% of the same catalyst, α-diazoketones led to α-silylketones in low to good yields (up to 70%).
Iron-Catalyzed Carbene Insertion Reactions of α-Diazoesters into Si–H Bonds
作者:Hoda Keipour、Thierry Ollevier
DOI:10.1021/acs.orglett.7b02488
日期:2017.11.3
An efficient iron-catalyzed carbene insertion reaction of α-diazo carbonyl compounds into the Si–H bond was developed. A wide range of α-silylesters was obtained in high yields (up to 99%) from α-diazoesters using a simple iron(II) salt as catalyst.