19523-03-6Relevant articles and documents
Discovery of Novel 3-Amino-4-alkoxyphenylketones as PDE4 Inhibitors with Improved Oral Bioavailability and Safety against Spatial Memory Impairments
Feng, Kai-Wen,He, Jia-Peng,Liu, Lu,Wang, Hai-Tao,Xia, Chuang,Xu, Jiang-Ping,Zheng, Lei,Zhou, Zhong-Zhen
, p. 390 - 405 (2022/02/07)
To realize PDE4 inhibitors with good developmental potentiality for the treatment of dementia, structure-based optimizations of lead compound FCPR03 resulted in novel aminophenylketones 9c and 9H with low nanomolar potency, which displayed comparable acti
Aminophenone compounds as well as preparation method and application thereof
-
Paragraph 0047-0050; 0229-0233, (2021/02/06)
The invention belongs to the technical field of medicinal chemistry, and particularly relates to aminophenone compounds as well as a preparation method and application thereof. The aminophenone compounds provided by the invention have a good inhibition effect on PDE4, also have good bioavailability, can be applied to preparation of drugs for treating PDE4-related diseases, and increase the optionsof drugs for treating PDE4-related diseases; and the effect of a part of the aminophenone compounds is equivalent to the effect of positive drugs, and the aminophenone compounds have good developmentpotential.
Rhodium-Catalyzed Deoxygenation and Borylation of Ketones: A Combined Experimental and Theoretical Investigation
Tao, Lei,Guo, Xueying,Li, Jie,Li, Ruoling,Lin, Zhenyang,Zhao, Wanxiang
supporting information, p. 18118 - 18127 (2020/11/26)
The rhodium-catalyzed deoxygenation and borylation of ketones with B2pin2 have been developed, leading to efficient formation of alkenes, vinylboronates, and vinyldiboronates. These reactions feature mild reaction conditions, a broad substrate scope, and excellent functional-group compatibility. Mechanistic studies support that the ketones initially undergo a Rh-catalyzed deoxygenation to give alkenes via boron enolate intermediates, and the subsequent Rh-catalyzed dehydrogenative borylation of alkenes leads to the formation of vinylboronates and diboration products, which is also supported by density functional theory calculations.
A sustainable multicomponent pyrimidine synthesis
Deibl, Nicklas,Ament, Kevin,Kempe, Rhett
supporting information, p. 12804 - 12807 (2015/10/28)
Since alcohols are accessible from indigestible biomass (lignocellulose), the development of novel preferentially catalytic reactions in which alcohols are converted into important classes of fine chemicals is a central topic of sustainable synthesis. Multicomponent reactions are especially attractive in organic chemistry as they allow the synthesis of large libraries of diversely functionalized products in a short time when run in a combinatorial fashion. Herein, we report a novel, regioselective, iridium-catalyzed multicomponent synthesis of pyrimidines from amidines and up to three (different) alcohols. This reaction proceeds via a sequence of condensation and dehydrogenation steps which give rise to selective C-C and C-N bond formations. While the condensation steps deoxygenate the alcohol components, the dehydrogenations lead to aromatization. Two equiv of hydrogen and water are liberated in the course of the reactions. PN5P-Ir-pincer complexes, recently developed in our laboratory, catalyze this sustainable multicomponent process most efficiently. A total of 38 different pyrimidines were synthesized in isolated yields of up to 93%. Strong points of the new protocol are its regioselectivity and thus the immediate access to pyrimidines that are highly and unsymmetrically decorated with alkyl or aryl substituents. The combination of this novel protocol with established methods for converting alcohols to nitriles now allows to selectively assemble pyrimidines from four alcohol building blocks and 2 equiv of ammonia.
Catalytic asymmetric addition of alkyllithium reagents to aromatic aldehydes
Fernandez-Mateos, Emilio,MacIa, Beatriz,Yus, Miguel
supporting information; body text, p. 3732 - 3736 (2012/09/21)
Herein, we report the first efficient catalytic system for the asymmetric alkylation of aldehydes with organolithium reagents in the presence of titanium(IV) isopropoxide. A variety of alkyllithium reagents can be added to aromatic aldehydes in good yields with high enantioselectivities in a simple one-pot procedure under mild conditions. Herein, we report the first efficient catalytic system for the asymmetric alkylation ofaldehydes with organolithium reagents in the presence of titanium(IV) isopropoxide. A variety of alkyllithium reagents can be added to aromatic aldehydes in good yields with high enantioselectivities in a simple one-pot procedure under mild conditions. Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Chiral organomagnesiates as dual reagents for bromine-magnesium exchange of 2-bromopyridine and access to chiral α-substituted 2-pyridylcarbinols
Catel, Delphine,Chevallier, Floris,Mongin, Florence,Gros, Philippe C.
supporting information; experimental part, p. 53 - 57 (2012/02/06)
New chiral ligand containing butyl and dibutylmagnesiates have been prepared from a range of ligands and their reactivity studied. The reagents were generally efficient in promoting the clean bromine-magnesium exchange of 2-bromopyridine at room temperature and the subsequent reaction with aldehydes to afford α-substituted 2-pyridylcarbinols in good yields. (R,R)-TADDOLate proved to be the best ligand, leading to acceptable to good enantioselectivities. To the best of our knowledge this is the first example of an organomagnesiate-induced halogen-metal exchange followed by an enantioselective addition.
Efficient chemoselective addition of grignard reagents to carbonyl compounds in 2-methyltetrahydrofuran
Zhong, Weihui,Wu, Yaotiao,Zhang, Xingxian
experimental part, p. 370 - 373 (2009/12/25)
Compared with tetrahydrofuran (THF) as a solvent for the addition reactions between Grignard reagents and carbonyl compounds 2-methyltetrahydrofuran affords the corresponding adducts in higher yields with higher chemoselectivities. Moreover, 2-methyltetrahydrofuran can be readily recycled and reused, which lowers the cost of the process and makes the reaction greener.
Organozinc generation via the titanium-catalyzed activation of alkyl halides
Fleury, Lauren M.,Ashfeld, Brandon L.
supporting information; scheme or table, p. 5670 - 5673 (2010/03/01)
[Chemical Equation Presented] A protocol for the generation of organozinc reagents via catalytic activation of alkyl halides is described herein. Subsequent nucleophilic addition to carbonyl derivatives provided the desired products in good to excellent y
Alkylation of aldehydes with trialkylboranes in water
Hirano, Koji,Yorimitsu, Hideki,Oshima, Koichiro
, p. 1543 - 1546 (2007/10/03)
Water enables the alkylation of aldehydes with trialkylboranes under nickel catalysis without the addition of a base. Trialkylboranes prepared from borane-dimethyl sulfide and terminal olefins via hydroboration as well as commercially available trialkylboranes could be employed for the reaction. The reaction would proceed via η2-coordinated nickel complexes with aldehydes as the key intermediates.
Alkylation of Aldehyde (Arenesulfonyl)hydrazones with Trialkylboranes
Kabalka, George W.,Maddox, John T.,Bogas, Ekaterini,Kelley, Shane W.
, p. 3688 - 3695 (2007/10/03)
(Arenesulfonyl)hydrazone derivatives of aryl aldehydes are readily alkylated by trialkylboranes in the presence of base to generate new organoboranes that may be converted to the corresponding substituted alkanes or alcohols depending upon the reaction conditions chosen. Both tosyl- and trisylhydrazone derivatives can be utilized in the reaction, which tolerates a variety of functional groups, making it a versatile alternative to both the Grignard and Suzuki-coupling reactions.