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。
Enantioselective vinylogous-Mukaiyama-type dearomatisation by anion-binding catalysis
作者:Kirandeep Kaur、Jorge Humbrías-Martín、Leon Hoppmann、Jose A. Fernández-Salas、Constantin G. Daniliuc、José Alemán、Olga García Mancheño
DOI:10.1039/d1cc03514b
日期:——
The first enantioselective vinylogous Mukaiyama-type dearomatisation of heteroarenes under anion-bindingcatalysis is presented. A recyclable tetrakistriazole catalyst was used for the enantiocontrol of the remote vinylogous active position of silyl dienol ethers. This approach provided chiral heterocycles bearing α,β-unsaturated chains with complete regioselectivity and excellent enantioselectivities
Chiral Helical Oligotriazoles: New Class of Anion-Binding Catalysts for the Asymmetric Dearomatization of Electron-Deficient <i>N</i>-Heteroarenes
作者:Mercedes Zurro、Sören Asmus、Stephan Beckendorf、Christian Mück-Lichtenfeld、Olga García Mancheño
DOI:10.1021/ja507940k
日期:2014.10.8
Helical chirality and selective anion-binding processes are key strategies used in nature to promote highly enantioselective chemical reactions. Although enormous efforts have been made to develop simple helical chiral systems and thus open new possibilities in asymmetriccatalysis and synthesis, the efficient use of synthetic oligo- and polymeric helical chiral catalysts is still very challenging
Enantioselective organocatalytic synthesis of α-allylated dihydroquinolines
作者:Sumi Joseph、Qui-Nhi Duong、Lukas Schifferer、Olga García Mancheño
DOI:10.1016/j.tet.2022.132767
日期:2022.5
An enantioselective anion-binding catalyzed allylation method allowing for rapid access to chiral α-allyl dihydroquinolines has been developed. These chiral N-heterocycles were achieved in good yields (up to 90%) and with up to 89:11 e. r. using a tetrakis-triazole-based hydrogen-bond donor catalyst. The versatility of the allyl moiety in the formed products was further demonstrated by selective post-epoxidation
已经开发了一种对映选择性阴离子结合催化的烯丙基化方法,可以快速获得手性 α-烯丙基二氢喹啉。使用基于四-三唑的氢键供体催化剂,这些手性N-杂环以良好的产率(高达 90%)和高达 89:11 的效率获得。通过选择性后环氧化和氮丙啶化反应进一步证明了所形成产物中烯丙基部分的多功能性,从而产生具有多达四个立体中心和 94:6 er 的高度修饰的手性分子