Preparation of Halogenated Fluorescent Diaminophenazine Building Blocks
Journal Article
·
· Journal of Organic Chemistry
- Yale Univ., New Haven, CT (United States)
A short, convenient, and scalable protocol for the one-pot synthesis of a series of fluorescent 7,8-dihalo-2,3-diaminophenazines is introduced. The synthetic route is based on the oxidative condensation of 4,5-dihalo-1,2-diaminobenzenes in aqueous conditions. The resulting diaminophenazines could be attractive intermediates for the preparation of polyfunctional phenazines and extended polyheteroacenes. We find that the undesired hydroxylation byproducts, typically obtained in aqueous conditions, are completely suppressed by addition of a stoichiometric amount of acetone during the oxidation step allowing for selective formation of 7,8-dihalo-2,2-dimethyl-2,3-dihydro-1H-imidazo[4,5-b]phenazine derivatives with good to excellent yields. Under reductive conditions, the imidazolidine ring can be hydrolyzed into the desired 7,8-dihalo-2,3-diaminophenazines. Furthermore, we report a selective route under highly reducing conditions to monohydrodeaminate the 2,3-di(methylamino) phenazine derivatives, which allows for further structural variations of these phenazine building blocks. Finally, all of these derivatives are luminescent, with measured fluorescence quantum-yields of up to 80% in ethanol for the more rigid structures, highlighting the potential of such materials to provide new fluorophores.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Argonne-Northwestern Solar Energy Research Center (ANSER)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- FG02-07ER15909; SC0001059
- OSTI ID:
- 1370815
- Journal Information:
- Journal of Organic Chemistry, Journal Name: Journal of Organic Chemistry Journal Issue: 20 Vol. 80; ISSN 0022-3263
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Imidazolidine Ring Cleavage upon Complexation with First-Row Transition Metals: Imidazolidine Ring Cleavage upon Complexation with First-Row Transition Metals
|
journal | September 2017 |
An efficient and environmentally sustainable domino protocol for the synthesis of structurally diverse spiroannulated pyrimidophenazines using erbium doped TiO 2 nanoparticles as a recyclable and reusable heterogeneous acid catalyst
|
journal | January 2018 |
Similar Records
1,2,3,9a-Tetrahydro-9H-imidazo(1,2-a)indoles
Prostaglandin synthetase dependent activation of 7,8-dihydro-7,8-dihydroxy-benzo(a)pyrene to mutagenic derivatives
Comparing coordination uranyl(vi ) complexes with 2-(1 H -imidazo[4,5- b ]phenazin-2-yl)phenol and derivatives
Journal Article
·
Sat Aug 01 00:00:00 EDT 1987
· Chem. Heterocycl. Compd. (Engl. Transl.); (United States)
·
OSTI ID:5099456
Prostaglandin synthetase dependent activation of 7,8-dihydro-7,8-dihydroxy-benzo(a)pyrene to mutagenic derivatives
Journal Article
·
Mon May 15 00:00:00 EDT 1978
· Biochem. Biophys. Res. Commun.; (United States)
·
OSTI ID:6893482
Comparing coordination uranyl(
Journal Article
·
Thu Dec 31 23:00:00 EST 2020
· Dalton Transactions
·
OSTI ID:1852918
Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
bio-inspired
catalysis (heterogeneous)
catalysis (homogeneous)
charge transport
defects
electrodes - solar
hydrogen and fuel cells
materials and chemistry by design
membrane
optics
photosynthesis (natural and artificial)
solar (fuels)
solar (photovoltaic)
spin dynamics
synthesis (novel materials)
synthesis (self-assembly)
bio-inspired
catalysis (heterogeneous)
catalysis (homogeneous)
charge transport
defects
electrodes - solar
hydrogen and fuel cells
materials and chemistry by design
membrane
optics
photosynthesis (natural and artificial)
solar (fuels)
solar (photovoltaic)
spin dynamics
synthesis (novel materials)
synthesis (self-assembly)