58557-62-3

Upstream product

• 6638-61-5 2-bromo-7-nitro-9H-fluorene 
• 64-19-7 acetic acid 
• 53622-33-6 2-bromo-phenanthrene-9,10-dione 
• 607-57-8 2-nitro-9H-fluorene 
• 3096-52-4 2-nitro-9H-fluoren-9-one 
• 486-25-9 9-fluorenone 
• 3096-56-8 2-bromofluoren-9-one 
• 1940-57-4 9H-fluoren-9-yl bromide 

Downstream Products

• 58557-63-4 2-amino-7-bromo-9H-fluoren-9-one 
• 58557-68-9 2-(7-Amino-9-oxo-9H-fluoren-2-ylamino)-benzoic acid 
• 58557-74-7 N-(Bromofluorenon-9-yl-2)-anthranilsaeure 
• 23842-56-0 2-bromo-7-nitro-fluoren-9-one oxime 

Relevant academic research and scientific papers

COMPOSITIONS AND METHODS OF MAKING EXPANDED HEMATOPOIETIC STEM CELLS USING DERIVATIVES OF FLUORENE

This invention is directed to, inter alia, compounds, methods, systems, and compositions for the maintenance, enhancement, and expansion of hematopoietic stem cells derived from one or more sources of CD34+ cells. Sources of CD34+ cells include bone marrow, cord blood, mobilized peripheral blood, and non-mobilized peripheral blood. Also provided herein are compounds of Formula I which are useful in maintaining, enhancing, and expanding of hematopoietic stem cells.

Synthesis and radiofluorination of novel fluoren-9-one based derivatives for the imaging of α7 nicotinic acetylcholine receptor with PET

By structure–activity relationship studies on the tilorone scaffold, the ‘one armed’ substituted dibenzothiophenes and the fluoren-9-ones were identified as the most potential α7 nAChR ligands. While the suitability of dibenzothiophene derivatives as PET tracers is recognized, the potential of fluoren-9-ones is insufficiently investigated. We herein report on a series of fluoren-9-one based derivatives targeting α7 nAChR with compounds 8a and 8c possessing the highest affinity and selectivity. Accordingly, with [18F]8a and [18F]8c we designed and initially evaluated the first fluoren-9-one derived α7 nAChR selective PET ligands. A future application of these radioligands is facilitated by the herein presented successful implementation of fully automated radiosynthesis.

Design, synthesis and biological evaluation of 1,4-Diazobicylco[3.2.2]nonane derivatives as α7-Nicotinic acetylcholine receptor PET/CT imaging agents and agonists for Alzheimer's disease

α7-Nicotinic acetylcholine receptor (α7-nAChR) agonists are promising therapeutic drug candidates for treating the cognitive impairment associated with Alzheimer's disease (AD). Thus, a novel class of derivatives of 1,4-diazobicylco[3.2.2]nonane has been synthesized and evaluated as α7-nAChR ligands. Five of them displayed high binding affinity (Ki = 0.001–25 nM). In particular, the Ki of 14 was 0.0069 nM, which is superior to that of the most potent ligand that was previously reported by an order of magnitude. Four of them had high selectivity for α7-nAChRs over α4β2-nAChRs and no significant hERG (human ether-a-go-go-related gene) inhibition. Their agonist activity was also discussed preliminarily. One of the compounds, 15 (Ki = 2.98 ± 1.41 nM), was further radiolabeled with 18F to afford [18F]15 for PET imaging, which exhibited high initial brain uptake (11.60 ± 0.14%ID/g at 15 min post injection), brain/blood value (9.57 at 30 min post injection), specific labeling of α7-nAChRs and fast clearance from the brain. Blocking studies demonstrated that [18F]15 was α7-nAChR selective. In addition, micro-PET/CT imaging in normal rats further indicated that [18F]15 had obvious accumulation in the brain. Therefore, [18F]15 was proved to be a potential PET radiotracer for α7-nAChR imaging.

A New Photocage Derived from Fluorene

Photolabile protecting groups (PPGs or photocages) are increasingly subject to molecular design to meet requirements such as absorbance in the visible spectral range, high molar absorption coefficients, and high quantum yields of leaving group release. Improvements in these properties for the promising 3-diethylaminobenzyl (DEAMb) photocage, the photoactivity of which is based on the Zimmerman meta effect, are reported. Expansion of the aromatic system with a second aromatic ring resulted in improved spectral properties. A systematic trend relating the electronic (π-donor or acceptor) properties of the new aryl substituent and its position in the DEAMb ring to changes in the spectral properties could be observed. Conclusions from the experimental results were supported by computations obtained by using time-dependent DFT. A second generation of DEAMb-based photocages was designed. A rigid linker was introduced to ensure more efficient conjugation of the aromatic ring π systems by limiting rotational freedom. The resulting fluorenol (9-hydroxyfluorene)-based photocages had superior spectral properties to those of simple biphenyl systems. The best uncaging cross section achieved was 5320 m?1 cm?1 (?Φ365).

Ligand compound of alpha7 nicotinic acetylcholine receptor and application of ligand compound

The embodiment of the invention provides a ligand compound of an alpha7 nicotinic acetylcholine receptor, the ligand compound has one of the following general formulas: wherein (1) X and R1 are shown in the description, and R7 is halogen; (2) R2 is hydrogen, and R3 is halogen or amino; or R3 is hydrogen, and R2 is halogen or amino; (3) R6 is hydrogen, and R4 and R5 are synthesized into a compound shown in the description; or R4 is hydrogen, and R5 and R6 are synthesized into a compound shown in the description; R8 is halogen; and (4) Y is nitrogen or carbon, Z is shown in the description, and R9 and R10 are respectively halogens. The provided ligand compound is an excellent ligand compound of the alpha7 nicotinic acetylcholine receptor. After being chemically marked radioactively, the provided ligand compound of the alpha7 nicotinic acetylcholine receptor can serve as a PET photographic developer.

Aerobic oxidation of 9H-fluorenes to 9-fluorenones using mono-/multilayer graphene-supported alkaline catalyst

The synthesis of 9-fluorenone derivatives has been achieved in high yield and with high purity by aerobic oxidation of 9H-fluorenes at room temperature in the presence of a graphene-supported KOH composite that acts as a catalyst in N,N-dimethylformamide. The new protocol involves very simple work-up procedures, and the solvent and the catalyst can be recycled and reused. A scaled-up preparative study employing this method was also conducted and showed its advantages of being both cost-effective and environmentally friendly, and has potential for application in industrial processes. Copyright

Highly efficient synthesis of 9-fluorenones from 9H-fluorenes by air oxidation

9-Fluorenones substituted with nitro, halogen, or alkyl groups can be easily obtained in high yield and purity by aerobic oxidation of 9H-fluorenes under ambient conditions in the presence of KOH in THF.

Improved, highly efficient, and green synthesis of bromofluorenones and nitrofluorenones in water

A series of bromo-, nitro-, and bromonitrofluorenones were synthesized chemo-and regioselectively in 90-98% yield via electrophilic aromatic bromination and nitration under mild conditions using water as the sole solvent. These synthetic methods involve simple workup procedures and use only minimal amounts of organic solvents during the purification of products. The newly developed methods have the advantages of being cost-effective and environmentally friendly and could potentially be used for the large-scale synthesis of fluorenone derivatives. Copyright Taylor & Francis Group, LLC.