A Catalyst-Free Amination of Functional Organolithium Reagents by Flow Chemistry
作者:Heejin Kim、Yuya Yonekura、Jun-ichi Yoshida
DOI:10.1002/anie.201713031
日期:2018.4.3
of functional organolithium intermediates with well‐designed aminating reagents under mild reaction conditions using flow microreactors. The aminating reagents were optimized to achieve efficient C−N bond formation without using any catalyst. The electrophilic amination reactions of functionalized aryllithiums were successfully conducted under mild reaction conditions, within 1 minute, by using flow
Nickel-Catalyzed 1,2-Carboamination of Alkenyl Alcohols
作者:Taeho Kang、Nana Kim、Peter T. Cheng、Hao Zhang、Klement Foo、Keary M. Engle
DOI:10.1021/jacs.1c07112
日期:2021.9.1
An alcohol-directed, nickel-catalyzed three-component umpolung carboamination of unactivated alkenes with aryl/alkenylboronic esters and electrophilic aminating reagents is reported. This transformation is enabled by specifically tailored O-(2,6-dimethoxybenzoyl)hydroxylamine electrophiles that suppress competitive processes, including undesired β-hydride elimination and transesterification between
Transition‐Metal Free Electrophilic Aminations of Polyfunctional<i>O</i>‐2,4,6‐Trimethylbenzoyl Hydroxylamines with Zinc and Magnesium Organometallics
作者:Alisa S. Sunagatullina、Andreas Hess、Alexander Kremsmair、Yifan Li、Yi‐Hung Chen、Paul Knochel
DOI:10.1002/anie.202304445
日期:2023.7.24
Various zinc and magnesium reagents were successfully aminated using O-2,4,6-trimethylbenzoyl hydroxylamines (O-TBHAs) leading to the corresponding tertiary alkyl amines in 52–99 % yield without any additional transition-metal catalyst. This reaction was extended to the preparation of optically enriched amines (up to 88 % ee) starting from enantioenriched secondary alkylmagnesium reagents of the type
<i>anti</i>-Selective synthesis of β-boryl-α-amino acid derivatives by Cu-catalysed borylamination of α,β-unsaturated esters
作者:Soshi Nishino、Yuji Nishii、Koji Hirano
DOI:10.1039/d2sc06003e
日期:——
borylamination of α,β-unsaturated esters with B2pin2 and hydroxylamines has been developed to deliver acyclic β-boryl-α-amino acid derivatives with high anti-diastereoselectivity (up to >99 : 1), which is difficult to obtain by the established methods. A chiral phosphoramidite ligand also successfully induces the enantioselectivity, giving the optically active β-borylated α-aminoacids. The products can be stereospecifically
已开发出铜催化的 α,β-不饱和酯与 B 2 pin 2和羟胺的区域选择性和非对映选择性硼胺化,以提供具有高抗非对映选择性(高达 >99 : 1)的无环 β-硼基-α-氨基酸衍生物),用现有的方法很难得到。手性亚磷酰胺配体也成功地诱导了对映选择性,产生光学活性的β-硼化α-氨基酸。该产品可以立体定向地转化为β-功能化的α-氨基酸,这在药物化学领域具有重要意义。
Mechanistic Studies of the Copper-Catalyzed Electrophilic Amination of Diorganozinc Reagents and Development of a Zinc-Free Protocol
作者:Matthew J. Campbell、Jeffrey S. Johnson
DOI:10.1021/ol0702829
日期:2007.4.1
mechanism for the copper-catalyzed amination of diorganozincreagents by O-benzoyl-N,N-dialkylhydroxylamines is supported by following stereochemically defined organometallics through the reaction and by employing the endocyclic restriction test. A copper-catalyzed electrophilic amination of organomagnesium compounds is also described in which the use of zinc halides has been eliminated.