这项工作报告了一种通过有效的非均相催化剂将α-酮酰胺催化转移加氢(CTH)转化为β-氨基的可持续路线,其中钌掺入了氮化碳载体(Ru–gC 3 N 4)。还使用相同的载体筛选了其他不同的金属(如Ni或Pd),但没有一个显示出有效的活性。尽管基于使用所有上述催化剂的反应参数的优化,也已经观察到酮部分氢化为醇。使用场发射枪扫描电子显微镜(FEG-SEM),X射线衍射(XRD),X射线光电子能谱(XPS),红外(IR)光谱和热重分析(TGA)对催化剂进行了表征。此外,该催化剂已经再循环并进一步表征,并且对于CTH方法的反应性没有任何明显的变化。Ru–gC 3 N 4由于可循环利用的多相催化剂首次用于将α-酮基酰胺的CTH转化为β-氨基,因此该方法具有可持续性,因为使用了经济环保的异丙醇作为溶剂体系。所提出的催化体系显示出广泛的α-羟基酰胺和β-氨基衍生物底物,这些底物已通过1 H和13 C-NMR证实。
Synthesis of β-amino alcohols using the tandem reduction and ring-opening reaction of nitroarenes and epoxides
作者:Chongyang Shi、Cheng Ren、Erlei Zhang、Huile Jin、Xiaochun Yu、Shun Wang
DOI:10.1016/j.tet.2016.04.083
日期:2016.7
A high yield one-pot synthesis of β-amino alcohols from nitroarenes and 1,2-epoxides was developed, which utilizes inexpensive iron dust as a reducing agent and NH4Cl as the only additive in a 50% (v/v) ethanol solution. This new efficient synthetic approach tolerates a wide range of functionalities. The mild reaction conditions (e.g., 60 °C), together with the use of low cost and readily available
Synthesis of 1,2-amino alcohols by decarboxylative coupling of amino acid derived α-amino radicals to carbonyl compounds <i>via</i> visible-light photocatalyst in water
coupling reaction of N-aryl amino acids with aldehydes or ketones for the synthesis of various 1,2-amino alcohols by using water as the solvent at room temperature is described. This protocol is characterised by broad substrate scopes, mild reaction conditions and amenability to gram-scale synthesis, which opens up a simple, mild but effective method to produce 1,2-amino alcohols from readily available
Thiourea catalyzed aminolysis of epoxides under solvent free conditions. Electronic control of regioselective ring opening
作者:Swapandeep Singh Chimni、Neeraj Bala、Vaibhav A. Dixit、Prasad V. Bharatam
DOI:10.1016/j.tet.2010.02.053
日期:2010.4
A reactant economizing process for the regioselective aminolysis of epoxides using equimolar quantities of reactants catalyzed by the double hydrogen bond donor N,N'-bis[3,5-bis(trifluoromethyl)phenyl]thiourea is reported. Regioselectivity of the reaction is controlled by the electronic nature of the substituent on the styrene oxide, which has been substantiated on the basis of C-13 NMR data and DFT calculations. (C) 2010 Elsevier Ltd. All rights reserved.