five‐membered heteroaryl electrophiles fused with/without a benzene ring were found to couple with amines to produce heteroarylamines with broad structural diversity. The heteroarylamine formation proceeds through the cleavage of a heteroaryl−OMe bond by the nucleophilic attack of the amine based on the nucleophilic aromatic substitution (SNAr) reaction. In contrast to the corresponding traditional SNAr amination
在铟路易斯酸催化下,与/不与苯环稠合的富电子五元杂芳基亲电试剂与胺偶合生成具有广泛结构多样性的杂芳基胺。通过基于亲核芳香取代(S胺的亲核攻击,通过杂芳基- OME键的裂解的杂芳基形成前进Ñ AR)反应。与相应的传统S N Ar胺形成对比,目前基于S N Ar的杂芳基胺化反应无需依赖具有吸电子基团的杂芳基亲电子试剂和亲核性增强的金属酰胺。对NO 2,Br,I,CF 3等官能团的高度相容性观察到CN,CO 2 Et,吡啶基,噻唑基,C = C和OH基团,从而表明该方法的实用性和可靠性。机理研究表明,在此过程中,杂芳基环上可能会形成碳-铟键。
Palladium-Catalyzed Domino CH/NH Functionalization: An Efficient Approach to Nitrogen-Bridged Heteroacenes
作者:Natsuyo Kamimoto、Dieter Schollmeyer、Koichi Mitsudo、Seiji Suga、Siegfried R. Waldvogel
DOI:10.1002/chem.201500897
日期:2015.5.26
Palladium‐catalyzed domino CH/NH functionalization for the synthesis of novel nitrogen‐bridged thienoacenes and 10H‐benzo[4,5]thieno[3,2‐b]indole derivatives from dihaloarene is reported. This domino sequence consists of initial CH functionalization of the benzo[b]thiophene moiety, followed by Buchwald–Hartwig coupling. This transformation is also useful for the synthesis of highly π‐extended compounds.
钯催化的多米诺Ç H /Ñ ħ官能新型含氮桥连thienoacenes的合成和10 ħ -苯并[4,5]噻吩并[3,2- b ]报道从二卤代芳烃吲哚衍生物。该多米诺序列由苯并[ b ]噻吩部分的初始CH功能化,然后是布赫瓦尔德-哈特维格偶联。这种转变对于合成高度π扩展的化合物也很有用。
Palladium-Catalysed Amination of Electron-Deficient or Relatively Electron-Rich Benzo[b]thienyl Bromides− Preliminary Studies of Antimicrobial Activity and SARs
作者:Maria-João R. P. Queiroz、Agathe Begouin、Isabel C. F. R. Ferreira、Gilbert Kirsch、Ricardo C. Calhelha、Sandra Barbosa、Letícia M. Estevinho
DOI:10.1002/ejoc.200400218
日期:2004.9
Several diarylamines in the benzo[b]thiophene series were prepared in good to high yields by palladium-catalysed amination of ethyl 3-bromobenzo[b]thiophene-2-carboxylate with anilines and 5-aminoindole in the presence of Pd(OAc)2, BINAP and Cs2CO3 in toluene. The presence of the ester group at the 2-position of the benzo[b]thiophene moiety increases the yields and lowers the heating times relative