Synthesis of indoles, benzofurans, and related heterocycles via an acetylene-activated S<sub>N</sub>Ar/intramolecular cyclization cascade sequence in water or DMSO
作者:R. Hudson、N. P. Bizier、K. N. Esdale、J. L. Katz
DOI:10.1039/c4ob02549k
日期:——
The synthesis of 2-substituted indoles and benzofurans was achieved by nucleophilic aromatic substitution, followed by subsequent 5-endo-dig cyclization between the nucleophile and an ortho acetylene. The acetylene serves the dual role of the electron withdrawing group to activate the substrate for SNAr, and the C1–C2 carbon scaffold for the newly formed 5-membered heteroaromatic ring. This method
2-取代的吲哚和苯并呋喃的合成是通过亲核芳族取代,随后在亲核体和邻乙炔之间进行5-endo-dig环化来实现的。乙炔起着吸电子基团的双重作用,以激活S N Ar的底物,而C1-C2碳骨架则用于新形成的5元杂芳族环。这种方法可以使Ar–X–N / O–C1的键形成顺序在一个合成步骤中进行,从而以中等至高收率提供吲哚和苯并呋喃。由于该方法不是过渡金属介导的,因此可以耐受溴化和氯化的底物,可以使用水或水-DMSO混合物作为溶剂进行苯并呋喃的形成。
Iron(II)‐Based Metalloradical Activation: Switch from Traditional Click Chemistry to Denitrogenative Annulation
catalytic amount of Fe(TPP)Cl and Zn dust. The reaction precludes the traditional, more favored click reaction between an organic azide and alkynes, and instead proceeds by an unprecedented metalloradicalactivation. The method is anticipated to advance access to the construction of important basic nitrogen heterocycles, which will in turn enable discoveries of new drug candidates.
Triphenylphosphine derivative, production process therefor, palladium complex thereof, and process for producing biaryl derivative
申请人:——
公开号:US20030065208A1
公开(公告)日:2003-04-03
Provided are a novel triphenyl phosphine derivative synthesized from a triphenylphosphine and a hydroxy-containing lactone; a palladium and a nickel complexes comprising the derivative as a ligand; and a process for preparing a biaryl derivative using the complex as a catalyst. A product can be easily separated from a catalyst or a phosphorus compound, and biaryl derivative can be synthesized in a higher yield, by using the complex of the present invention as a catalyst.
TRIPHENYLPHOSPHINE DERIVATIVE, PRODUCTION PROCESS THEREFOR, PALLADIUM COMPLEX THEREOF, AND PROCESS FOR PRODUCING BIARYL DERIVATIVE
申请人:Mitsubishi Rayon Co., Ltd.
公开号:EP1270582A1
公开(公告)日:2003-01-02
Provided are a novel triphenyl phosphine derivative synthesized from a triphenylphosphine and a hydroxy-containing lactone; a palladium and a nickel complexes comprising the derivative as a ligand; and a process for preparing a biaryl derivative using the complex as a catalyst. A product can be easily separated from a catalyst or a phosphorus compound, and biaryl derivative can be synthesized in a higher yield, by using the complex of the present invention as a catalyst.
A trisulfur radical anion (S3.−) triggered domino thienannulation strategy for the synthesis of dibenzo[d,d′]thieno[2,3-b;4,5-b′]dithiophenes (DBTDTs) has been developed. This domino protocol is featured by no metal catalyst and the formation of six C−S and one C−C bonds in one-pot reaction. A plausible mechanism has been proposed by control experiments, intermediate trapping experiments, etc. The
开发了一种三硫自由基阴离子(S 3 .− )触发的多米诺噻吩环化策略,用于合成二苯并[ d,d' ]噻吩并[2,3- b ;4,5- b ']二噻吩(DBTDT)。该多米诺骨牌协议的特点是无需金属催化剂,在一锅反应中形成六个 C−S 和一个 C−C 键。通过控制实验、中间捕获实验等提出了一种合理的机制。DBTDT独特的不对称结构赋予其人字形堆积结构和分子间弱的S⋅⋅⋅S相互作用以及高转移积分,从而实现高载流子有机场效应晶体管的迁移率为1.52 cm 2 V -1 s -1 。