Metalated Nitriles: Organolithium, -magnesium, and -copper Exchange of α-Halonitriles
作者:Fraser F. Fleming、Zhiyu Zhang、Wang Liu、Paul Knochel
DOI:10.1021/jo047877r
日期:2005.3.1
dimethylcuprate reagents generating reactive, metalated nitriles. The rapid halogen−metal exchange with alkyllithium and Grignard reagents allows selective exchange in the presence of reactive carbonyl electrophiles, including aldehydes, providing a high-yielding alkylation protocol. Lithiated and magnesiated nitriles react with propargyl bromide by SN2 displacement whereas organocopper nitriles react
α-卤代腈与烷基锂,有机镁和二甲基cup酸锂试剂反应生成活性的金属化腈。与烷基锂和格氏试剂的快速卤素金属交换可在存在醛的反应性羰基亲电试剂存在下进行选择性交换,从而提供了高产率的烷基化方案。锂化和氧化镁腈通过S N 2置换与炔丙基溴反应,而有机铜腈通过S N 2'置换反应,与C-金属化腈的形成相关。
Catalytic One-Pot Synthesis of Cyclic Amidines by Virtue of Tandem Reactions Involving Intramolecular Hydroamination under Mild Conditions
作者:Sukbok Chang、Minjae Lee、Doo Young Jung、Eun Jeong Yoo、Seung Hwan Cho、Sun Kyu Han
DOI:10.1021/ja064788i
日期:2006.9.1
A newsynthetic methodology for the generation of cyclic amidines has been developed by the reaction of 1,n-aminoalkynes with electron-deficient azides using a ruthenium catalyst at ambient temperature. The reaction proceeds most likely via a tandem sequence of intramolecular hydroamination of aminoalkynes, cycloaddition of azides with the resulting enamines, and rearrangement of triazoline intermediates
Different Selectivities in the Insertions into C(sp<sup>2</sup>
)−H Bonds: Benzofulvenes by Dual Gold Catalysis Competition Experiments
作者:Alex J. Plajer、Lukas Ahrens、Marcel Wieteck、Danilo M. Lustosa、Rasool Babaahmadi、Brian Yates、Alireza Ariafard、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/chem.201801031
日期:2018.7.25
quantitative access to tricyclic aromatic compounds by dualgoldcatalysis was developed. This synthetic route expands the scope of benzofulvene derivatives through a C(sp2)−H bond insertion in easily available starting materials. The insertion takes place with an exclusive chemoselectivity with respect to the competing aromatic C−H positions. A bidirectional synthesis with two competing ortho‐aryl C−H bonds