流动微反应器技术的最新发展允许使用间歇式反应器无法实现的瞬态有机锂化合物。然而,在“卤素舞蹈”中捕获瞬态芳基锂仍然具有挑战性。本文报道了通过使用卤化锌二胺配合物开发微调的原位锌化,在间歇反应器中捕获这种短寿命的唑基锂。The reaction rate is controlled by the appropriate choice of diamine ligand. 该反应操作简单,可在 0 °C 下进行,在多克规模上具有高重现性。该方法适用于广泛的溴化唑,允许去质子功能化,用于生物活性唑的两种结构异构体的简明发散合成。
Organozinc reagents are among the most commonly used organometallicreagents in modern synthetic chemistry, and multifunctionalized organozinc reagents can be synthesized from structurally simple, readily available ones by means of alkyne carbozincation. However, this method suffers from poor tolerance for terminal alkynes, and transformation of the newly introduced organic groups is difficult, which
Synthesis of Aryl <i>C</i>-Glycosides via Iron-Catalyzed Cross Coupling of Halosugars: Stereoselective Anomeric Arylation of Glycosyl Radicals
作者:Laksmikanta Adak、Shintaro Kawamura、Gabriel Toma、Toshio Takenaka、Katsuhiro Isozaki、Hikaru Takaya、Akihiro Orita、Ho C. Li、Tony K. M. Shing、Masaharu Nakamura
DOI:10.1021/jacs.7b03867
日期:2017.8.9
We have developed a novel diastereoselective iron-catalyzed cross-coupling reaction of various glycosyl halides with aryl metal reagents for the efficient synthesis of aryl C-glycosides, which are of significant pharmaceutical interest due to their biological activities and resistance toward metabolic degradation. A variety of aryl, heteroaryl, and vinyl metal reagents can be cross-coupled with glycosyl
Diagonally Related s‐ and p‐Block Metals Join Forces: Synthesis and Characterization of Complexes with Covalent Beryllium–Aluminum Bonds
作者:Albert Paparo、Cory D. Smith、Cameron Jones
DOI:10.1002/anie.201906609
日期:2019.8.12
comparison, isostructural Mg–Al and Zn–Al analogues of these complexes, viz. [(DipNacnac)(X)Al‐M(X)(tmeda)] (M=Mg or Zn, X=I or Br) have been prepared and structurally characterized. DFT calculations reveal all compounds to have high s‐character metal–metal bonds, the polarity of which is consistent with the electronegativities of the metals involved. Preliminary reactivity studies of [(DipNacnac)(Br)Al‐Be(Br)(tmeda)]
Group 2 and 12 Metal Gallyl Complexes Containing Unsupported Ga−M Covalent Bonds (M = Mg, Ca, Sr, Ba, Zn, Cd)
作者:Owen Bonello、Cameron Jones、Andreas Stasch、William D. Woodul
DOI:10.1021/om1001606
日期:2010.11.8
[:Ga(DAB)]− (DAB = N(Dip)C(H)}2, Dip = C6H3Pri2-2,6) with several group2 and 12 metal halide complexes are reported. Treatment of in situ generated [MI2(tmeda)n] (M = Ca, Sr, Ba; tmeda = N,N,N′,N′-tetramethylethylenediamine) with 2 equiv of [K(tmeda)][:Ga(DAB)] leads to salt elimination and formation of the neutral metal gallyl complexes trans-[MGa(DAB)}2(tmeda)2]. Reaction of [(Nacnac)MgI(OEt2)]
Synthesis and characterisation of anionic and neutral gallium(i) N-heterocyclic carbene analogues
作者:Deepak Dange、Sam L. Choong、Christian Schenk、Andreas Stasch、Cameron Jones
DOI:10.1039/c2dt30299c
日期:——
yield synthesis of a new, extremely bulky anionic gallium(I) N-heterocyclic carbeneanalogue, [(DAB*)Ga:]− (DAB* = N(Ar*)C(H)}2, Ar* = C6H2C(H)Ph2}2Me-2,6,4) has been developed and four monomeric sodium complexes of the heterocycle have been crystallographically characterised. The gallium(I) heterocycle has been utilised in the preparations of the heteroleptic zinc and cadmium gallyl complexes, [(DAB*)GaMX(tmeda)]