金(I)催化的双官能1,2-二苯基乙炔的可调谐多米诺环化反应获得苯并[ a ]咔唑和茚并[1,2- c ]喹啉
摘要:
通过改变底物的氮取代,在金的催化下精确调节了双官能1,2-二苯乙炔的环化顺序,从而轻松制备了苯并[ a ]咔唑和茚并[1,2- c ]喹啉衍生物。通过控制实验探索了这些多米诺环化的机理,并通过密度泛函理论(DFT)计算获得了对环化选择性的深入了解。这项研究代表了访问苯并[ a ]咔唑和茚并[1,2- c ]喹啉的统一而通用的方法。
Synthesis of Indole-Fused Polycyclics via Rhodium-Catalyzed Undirected C–H Activation/Alkene Insertion
作者:Songjin Guo、Rui Pan、Zhe Guan、Panpan Li、Libo Cai、Siwei Chen、Aijun Lin、Hequan Yao
DOI:10.1021/acs.orglett.9b02198
日期:2019.8.16
Rh(III)-catalyzed undirected C–H activation/alkeneinsertion to synthesize diversified indole-fused polycyclics has been developed. Intramolecular electrophilic cyclization generated a 3-indolyl rhodium species that went through an aryl-to-aryl 1,4-rhodium migration to realize the C–H activation. The subsequent [4 + 2] carboannulation or hydroarylation of alkenes could be achieved, respectively, by simply
A dramatic enhancing effect of InBr3 was observed towards the oxidative Sonogashira cross-coupling reaction of 2-ethynylaniline with (E)-trimethyl(3,3,3-trifluoroprop-1-enyl)silane.
Catalyst Pendent-Base Effects on Cyclization of Alkynyl Amines
作者:James M. Stubbs、Devon E. Chapple、Paul D. Boyle、Johanna M. Blacquiere
DOI:10.1002/cctc.201800713
日期:2018.9.7
A family of [CpRu(PP)(MeCN)]PF6 complexes (2 a–e and 4) were prepared in which the bis‐phosphine ligand contains a pendent tertiary amine in the second‐coordinationsphere. 2 a–e contain PPh2NR′2 ligands with two amine groups as the pendent base. Complex 4 has the PPh2NPh1 ligand with only one pendentamine. The catalytic performance of 2 a–e and 4 were assessed in the cyclization of 2‐ethynyl aniline
制备了一个[CpRu(PP)(MeCN)] PF 6配合物(2 a – e和4),其中双膦配体在第二配位领域包含一个侧基叔胺。2 - ë含有P博士2 Ñ R' 2点具有两个胺基团作为侧基的配体。配合物4具有仅具有一种侧胺的P Ph 2 N Ph 1配体。2 a – e和4的催化性能在2-乙炔基苯胺和2-乙炔基苄醇的环化中进行了评估。已经发现,侧链胺在金属活性位点附近的定位对于高催化剂性能是必不可少的。P的比较博士2 Ñ R' 2种催化剂(2 - ë)显示性能最小差作为侧胺碱度的函数。而是,仅需要阈值碱度(其中的侧链胺比底物更碱性)即可实现高性能。
Copper-Catalyzed Trifluoromethylation/Cyclization of Alkynes for Synthesis of Dioxodibenzothiazepines
作者:Zi-Qi Zhang、Yi-Hao Xu、Jing-Cheng Dai、Yan Li、Jie Sheng、Xi-Sheng Wang
DOI:10.1021/acs.orglett.1c00344
日期:2021.3.19
A facile and efficient approach for the synthesis of the CF3-containing dioxodibenzothiazepines has been developed via copper-catalyzed trifluoromethylation/cyclization of alkynes utilizing a radical relay strategy. This method has demonstrated low catalyst loading, high regiocontrol, and broad scope under mild conditions. Good compatibility for the N-protecting group, gram-scale experiment, and further