Regioselective, Photocatalytic α-Functionalization of Amines
摘要:
Photocatalytic alpha-functionalization of amines provides a mild and atom-economical means to synthesize alpha-branched amines. Prior examples featured symmetrical or electronically biased substrates. Here we report a controllable alpha-functionalization of amines in which regioselectivity can be tuned with minor changes to the reaction conditions.
Photoinduced
<scp>NaI‐Promoted</scp>
Radical Borylation of Alkyl Halides and Pseudohalides
作者:Chenglan Wang、Lu Zhou、Kai Yang、Feng Zhang、Qiuling Song
DOI:10.1002/cjoc.202100115
日期:2021.7
A method for photoinduced NaI-promoted radical borylation of aliphatic halides and pseudohalides with bis(catecholato)diboron (B2cat2) as the boron source is introduced. The borylation reaction is operationally simple and shows high functional group tolerance and broad substrate scope. Preliminary mechanistic studies suggest that the reaction proceeds through SN2-based radical-generation strategy.
介绍了一种以双(儿茶酚)二硼(B 2 cat 2 )为硼源的光诱导NaI促进的脂肪族卤化物和拟卤化物自由基硼化的方法。硼酸化反应操作简单,显示出高官能团耐受性和广泛的底物范围。初步机理研究表明,该反应通过基于S N 2 的自由基生成策略进行。
Coupling of C(sp<sup>3</sup>)–H bonds with C(sp<sup>2</sup>)–O electrophiles: mild, general and selective
benzylation of amines with benzylic alcohols to give benzylamines has been newly developed by using palladium/phosphine-borane catalyst system. In this catalytic reaction, the linking between both phosphine and borane moieties in the ligand is very important. Hydroxy group of benzylic alcohols is activated by Lewis acidic borane to form a benzylpalladium intermediate which is attacked by amines to give benzylamine
Reductive Amination of Aldehydes Using Aminoboranes as Iminium Ion Generators
作者:Michinori Suginome、Yusuke Tanaka、Tomoaki Hasui
DOI:10.1055/s-2006-939070
日期:——
2-Dialkylamino-4H-1,3,2-benzodioxaborins, salicyl alcohol derived aminoboranes, serve as efficient and mild iminium ion generators in the reductive amination of aldehydes with NaBH4. Using a diisopropylamino derivative, a variety of amines including secondary and primary amines, and ammonia can participate to the reductive amination in aprotic organic solvents without the use of acidic promoters.
Aza-Matteson Reactions via Controlled Mono- and Double-Methylene Insertions into Nitrogen–Boron Bonds
作者:Qiqiang Xie、Guangbin Dong
DOI:10.1021/jacs.1c06186
日期:2021.9.15
Boron-homologation reactions represent an efficient and programmable approach to prepare alkylboronates, which are valuable and versatile synthetic intermediates. The typical boron-homologation reaction, also known as the Matteson reaction, involves formal carbenoid insertions into C–B bonds. Here we report the development of aza-Matteson reactions via carbenoid insertions into the N–B bonds of aminoboranes