不饱和16E -片段[(C 5我5)的Rh(PME 3)]已观察到插入硫-碳键中的各种取代的二苯并噻吩,得到一个六元金属环产物。通过改变二苯并噻吩上取代基的位置和性质来探究CS插入的区域选择性,发现选择性受空间位阻的支配,且电子贡献较小。在4-甲基二苯并噻吩,2,6-二甲基二苯并噻吩和苯并[ b ]萘[2,1- d ]中发现仅插入空间受阻较小的CS键]噻吩。向未取代的环的插入是具有2-氟二苯并噻吩和2-甲氧基二苯并噻吩的两个CS插入异构体的主要产物。观察到2-(三氟甲基)二苯并噻吩和2-氰基二苯并噻吩向取代环的插入是有利的。在2-甲基二苯并噻吩,3-甲基二苯并噻吩,2,8-二甲基二苯并噻吩,1,3,7-三甲基二苯并噻吩和苯并[ b ]萘[1,2- d]噻吩。2-溴二苯并噻吩显示了C-Br激活以及两个CS插入产物(2:1),而2-碘二苯并噻吩仅显示了C-I激活。4,6-二甲基形成的不稳定的S
A Pd-catalyzed optional approach for the synthesis of dibenzothiophenes
作者:Juan Song、Hao Wu、Wei Sun、Songjiang Wang、Haisen Sun、Kang Xiao、Yan Qian、Chao Liu
DOI:10.1039/c8ob00235e
日期:——
A direct and practical approach for the construction of DBTs was developed via a Pd-catalyzed tandem reaction, in which commercially available o-bromo-iodobenzenes combined with benzene thiols or iodobenzenes combined with o-bromo-benzene thiols were applied. These two approaches will provide an alternative for the synthesis of DBT derivatives.
Synthesis and properties of thieno[2,3-d:5,4-d’]bisthiazoles and their oxidized derivatives: Thionyl chloride as a sulfurative ring-fusing reagent towards thiophene-based ring-fused heteroaromatic compounds
A new route to thiophene-ring-fused compounds with thionylchloride as a sulfur source was developed. Use of an excess amount thionylchloride directly gave the corresponding thiophene-ring-fused compound via further reduction of generated thiophene-S-oxide with excess thionylchloride in some cases. One-pot reduction with tributylphosphine also gave thiophene-ring-fused compounds in good yields, and
Synthesis of Functionalized Dibenzothiophenes - An Efficient Three-Step Approach Based on Pd-Catalyzed C-C and C-S Bond Formations
作者:Tue Heesgaard Jepsen、Mogens Larsen、Morten Jørgensen、Katarzyna A. Solanko、Andrew D. Bond、Anders Kadziola、Mogens Brøndsted Nielsen
DOI:10.1002/ejoc.201001393
日期:2011.1
A novel and efficientthree-step protocol for synthesizing functionalizeddibenzothiophenes (DBTs) from common starting materials and by using palladium-catalyzed carbon-carbon and carbon-sulfur bondformations is presented. The reaction conditions offer significantly improved functional-group tolerance and regioselectivity as compared to previously reported methods.
Iron‐catalyzed carbon–sulfur bond formation: Atom‐economic construction of thioethers with diaryliodonium salts
作者:Li Liu、Jian Qiang、Shuhua Bai、Yang Li、Jian Li
DOI:10.1002/aoc.3810
日期:2017.11
Diaryliodonium salts are characterized by poor atom economy with the formation of one equivalent of an iodoarene as waste. We have developed an atom‐economic iron‐catalyzed protocol for the synthesis of a variety of thioethers with diaryliodonium salts. Not only cyclic diaryliodonium salts but also linear diaryliodonium salts were found to perform well in the reactions.