Synthesis of Dibenzothiophenes and Related Classes of Heterocycles by Using Functionalized Dithiocarbamates
作者:Marcel Kienle、Andreas Unsinn、Paul Knochel
DOI:10.1002/anie.201001025
日期:2010.6.28
A round trip: Readily available dithiocarbamates can undergo ringclosure to give functionalized sulfurheterocycles (see scheme). These heteroaromatic compounds can be further functionalized by directed alumination and subsequently trapped with various electrophiles.
Using an easily prepared triethylammonium N‐benzyldithiocarbamate salt as a sulfur source, a dual C−S functionalization of cyclic diaryliodoniums to form tricyclic thioheterocycles is realized. Our method uses the readily available copper sulfate to accelerate the chemical transformation under mild conditions. A broad range of cyclic diaryliodoniums with a ring size from 5‐ to 7‐membered can be employed
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.
Green Preparation of Dibenzothiophene Derivatives Using 2-Biphenylyl Disulfides in the Presence of Molecular Iodine and Its Application to Dibenzoselenophene Synthesis
作者:Kota Nishino、Yohei Ogiwara、Norio Sakai
DOI:10.1002/ejoc.201701155
日期:2017.10.25
One-pot preparation of dibenzothiophene derivatives by a green method: Dibenzothiophenes are prepared from 2-biphenylyl disulfides by using molecular iodine as an oxidant. This protocol can lead to the direct preparation of dibenzoselenophene.