Synthesis and Electrochemical Properties of 2,2’-Biguaiazulene-Based 1,2-Dithiin and Thiophene
摘要:
The synthesis of diguaiazuleno[3,2-c:2',3'-e][1,2]dithiin was achieved by the reaction of 2,2'-biguaiazulene with disulfur dichloride/imidazole as a sulfuration reagent. Thermolysis of the dithiin afforded the corresponding desulfurized compound, diguaiazuleno[3,2-b:2',3'-d]thiophene. Cyclic voltammetry of the S-heterocycles showed one reversible wave at the reduction region, respectively.
Trimethylphosphate as a Methylating Agent for Cross Coupling: A Slow-Release Mechanism for the Methylation of Arylboronic Esters
作者:Zhi-Tao He、Haoquan Li、Alexander M. Haydl、Gregory T. Whiteker、John F. Hartwig
DOI:10.1021/jacs.8b10076
日期:2018.12.12
A methyl group on an arene, despite its small size, can have a profound influence on biologically active molecules. Typical methods to form a methylarene involve strong nucleophiles or strong and often toxic electrophiles. We report a strategy for a new, highly efficient, copper and iodide co-catalyzed methylation of aryl- and heteroarylboronic esters with the mild, nontoxic reagent trimethylphosphate
A transition-metal-free direct trifluoromethylthiolation of the ipso-carbon of lithium aryl boronates with trifluoromethanesulfenate under mild conditions was described. In addition, late-stage site-selective C–H borylation/trifluoromethylation and C–Cl borylation/trifluoromethylthiolation of biologically active molecules was developed. Initial mechanistic study suggested that the Li+ cation plays
A process for the concurrent transfer of both the NHC ligand and the difluoromethyl group from [(SIPr)Ag(CF2H)] to PdX2 (X = Cl, OAc, and OPiv) for the preparation of [(SIPr)Pd(CF2H)X] complexes is described. These complexes were air-stable and easily underwent transmetalation with aryl pinacolboronate/reductive elimination to generate ArCF2H in high yields. Based on this discovery, the first one-pot
materials entailing guaiazulene or naphthalene as electron donor unit were synthesized and characterized. The azulenyl and naphthyl groups have significant influences on their molecular properties and photovoltaic performances. Compared to naphthalenederivatives, azulene derivatives exhibit red-shifted and wider absorptionspectra. However, naphthalenederivatives exhibit much deeper highest occupied
Azulene Functionalization by Iron-Mediated Addition to a Cyclohexadiene Scaffold
作者:Petter Dunås、Lloyd C. Murfin、Oscar J. Nilsson、Nicolas Jame、Simon E. Lewis、Nina Kann
DOI:10.1021/acs.joc.0c01412
日期:2020.11.6
The functionalization of azulenes via reaction with cationic η5-iron carbonyl diene complexes under mild reaction conditions is demonstrated. A range of azulenes, including derivatives of naturally occurring guaiazulene, were investigated in reactions with three electrophilic iron complexes of varying electronic properties, affording the desired coupling products in 43–98% yield. The products were