Ceric ammonium nitrate-mediated detritylation of tritylated amines
摘要:
Efficient deprotection of tritylated amines to the corresponding amines mediated by 20 mol % ceric ammonium nitrate [Ce(NH4)(2)(NO3)(6), CAN], 10 equiv of acetic acid and 15 equiv of water in dichloromethane is presented. This method equally worked well in the case of morpholino nucleosides. (C) 2010 Elsevier Ltd. All rights reserved.
Pyrrole-Based Anion-Responsive π-Electronic Molecules as Hydrogen-Bonding Catalysts
作者:Goki Hirata、Hiromitsu Maeda
DOI:10.1021/acs.orglett.8b00855
日期:2018.5.18
boron complexes as hydrogen-bonding donor organocatalysts were examined by the Mannich-type reaction of N-acyl heteroarenium chlorides with 1-methoxy-2-methyl-1-trimethylsiloxy-1-propene, as well as by the classical N-alkylation of amines with trityl chloride under base-free conditions. 1H NMR examinations of the hydrogen-bonding interaction between the pyrrole NH of the catalyst and the Cl– in the
N-酰基杂芳基氯化物与1-甲氧基-2-甲基-1-三甲基甲硅烷氧基-1-丙烯的曼尼希型反应以及经典的N检验了二吡咯基二酮硼配合物作为氢键供体有机催化剂的能力。在无碱条件下用三苯甲基氯对胺进行烷基化。1个催化剂的吡咯NH和氯之间的氢键相互作用的1 H NMR检查-在Ñ酰基heteroarenium盐建议的激活Ñ酰基heteroarenium氯化物阴离子通过由催化剂发生结合。
Temporal control in tritylation reactions through light-driven variation in chloride ion binding catalysis – a proof of concept
作者:Surbhi Grewal、Saonli Roy、Himanshu Kumar、Mayank Saraswat、Naimat K. Bari、Sharmistha Sinha、Sugumar Venkataramani
DOI:10.1039/d0cy01090a
日期:——
photoswitchable catalysts T1–5 have been designed, synthesized and optimized for the tritylation reaction of benzylamine (BzNH2). The tritylation reaction rates/yields achieved by light induced isomerization are compared between the native and photoswitched states of the catalyst T1. This concept of controlling the tritylation reaction rates with light has also been extended to additional substrates. The
Moderated Basicity of Endohedral Amine Groups in an Octa‐Cationic Self‐Assembled Cage
作者:Courtney Ngai、Hoi‐Ting Wu、Bryce Camara、Christopher G. Williams、Leonard J. Mueller、Ryan R. Julian、Richard J. Hooley
DOI:10.1002/anie.202117011
日期:2022.3.7
An endohedrally functionalized self-assembled Fe4L6 cage complex with 12 internal amines in the cavity acts as an acid host, and shows differential basicity, moderated by the cage superstructure.
内嵌功能化的自组装 Fe 4 L 6笼状复合物在空腔中具有 12 个内部胺,充当酸主体,并显示不同的碱度,由笼上层结构缓和。
A convenient method for the preparation of primary amines using tritylamine
A simple method for the preparation of primary amines by treating N-tritylamines with trifluoroacetic acid has been established. The N-tritylamines were prepared by the reaction of alkyl halides or alkyl p-toluenesulfonates with tritylamine, or by the reaction of alkyl bromides with lithium tritylamide.
“Click” Bis-Triazoles as Neutral CH⋅⋅⋅Anion-Acceptor Organocatalysts
作者:Stephan Beckendorf、Sören Asmus、Christian Mück-Lichtenfeld、Olga García Mancheño
DOI:10.1002/chem.201203360
日期:2013.1.28
A new player on the field! “Click” bis‐triazoles have been introduced as a highly efficient new class of neutralCH⋅⋅⋅anion‐binding organocatalysts (see scheme). DFT and NMR studies were used to confirm this activation modus and identify the optimal catalyst.