Catalytic 1,2-Regioselective Dearomatization of N-Heteroaromatics via a Hydroboration
作者:Heng Liu、Maxim Khononov、Moris S. Eisen
DOI:10.1021/acscatal.8b00074
日期:2018.4.6
catalyzed highly 1,2-regioselective dearomatization of pyridines via a hydroboration process is reported herein. Twelve different kinds of meta- and para-substituted pyridines are applicable to this reaction, giving the corresponding N-boryl-1,2-dihydropyridine products in high yields. Other N-heteroaromatic compounds, such as benzo-fused N-heterocycles, pyrazines, pyrimidines, 1,3,5-triazine, and benzothiazole
甲基or和氢化物配合物(C 5 Me 5)2 ThMe 2和[(C 5 Me 5)2 Th(H)(μ-H)] 2通过氢硼化过程催化吡啶的高度1,2-区域选择性脱芳香化反应。在此报告。十二种间位和对位取代的吡啶适用于该反应,给出相应的N-硼基-1,2-二氢吡啶产物的收率高。还发现其他N-杂芳族化合物,例如苯并稠合的N-杂环,吡嗪,嘧啶,1,3,5-三嗪和苯并噻唑也具有高化学选择性的硼氢化。包括同位素效应研究在内的动力学表明,催化剂,吡啶和频哪醇硼烷的浓度具有一级依赖性,而脱芳香化的最终产物的释放是速率确定的步骤。在化学计量反应和动力学研究的基础上提出了一个合理的机制。
Atom-efficient regioselective 1,2-dearomatization of functionalized pyridines by an earth-abundant organolanthanide catalyst
作者:Alexander S. Dudnik、Victoria L. Weidner、Alessandro Motta、Massimiliano Delferro、Tobin J. Marks
DOI:10.1038/nchem.2087
日期:2014.12
synthesis. Dearomatization of pyridine derivatives is an important transformation to access a wide range of valuable nitrogenous natural products, pharmaceuticals and materials. Here, we report an efficient 1,2-regioselective organolanthanide-catalysed pyridine dearomatization process using pinacolborane, which is compatible with a broad range of pyridines and functional groups and employs equimolar
Regioselective 1,2-Dearomatization of Functionalized Azines by Organolanthanide Catalysts
申请人:Northwestern University
公开号:US20160159825A1
公开(公告)日:2016-06-09
A 1,2-regioselective organolanthanide-catalyzed azine dearomatization process using pinacolborane is disclosed.
揭示了一种使用缔合硼酸钙催化的1,2-区域选择性芳香烃脱芳构化过程。
Manganese‐Catalyzed Hydroborations with Broad Scope
作者:Pradip Ghosh、Axel Jacobi von Wangelin
DOI:10.1002/anie.202103550
日期:2021.7.12
synthetic manipulation and chemical valorization. The applications of catalytic hydrofunctionalization benefit from the use of liquid reducing agents and operationally facile setups. Metal-catalyzed hydroborations provide a highly prolific platform for reductive valorizations of stable C=X electrophiles. Here, we report an especially facile, broad-scope reduction of various functions including carbonyls
Iron-Catalyzed 1,2-Selective Hydroboration of <i>N</i>-Heteroarenes
作者:Fanjun Zhang、Heng Song、Xuewen Zhuang、Chen-Ho Tung、Wenguang Wang
DOI:10.1021/jacs.7b11416
日期:2017.12.13
A N2-bridged diiron complex [Cp*(Ph2PC6H4S)Fe]2(μ-N2) (1) has been found to catalyze the hydroboration of N-heteroarenes with pinacolborane, giving N-borylated 1,2-reduced products with high regioselectivity. The catalysis is initiated by coordination of N-heteroarenes to the iron center, while the B-H bond cleavage is the rate-determining step.