78573-23-6Relevant academic research and scientific papers
Hydroalkylation of Unactivated Olefins via Visible-Light-Driven Dual Hydrogen Atom Transfer Catalysis
Chang, Rui,Funes-Ardoiz, Ignacio,Lei, Guangyue,Xu, Meichen,Ye, Juntao
supporting information, p. 11251 - 11261 (2021/08/03)
Radical hydroalkylation of olefins enabled by hydrogen atom transfer (HAT) catalysis represents a straightforward means to access C(sp3)-rich molecules from abundant feedstock chemicals without the need for prefunctionalization. While Giese-type hydroalkylation of activated olefins initiated by HAT of hydridic carbon-hydrogen bonds is well-precedented, hydroalkylation of unactivated olefins in a similar fashion remains elusive, primarily owing to a lack of general methods to overcome the inherent polarity-mismatch in this scenario. Here, we report the use of visible-light-driven dual HAT catalysis to achieve this goal, where catalytic amounts of an amine-borane and an in situ generated thiol were utilized as the hydrogen atom abstractor and donor, respectively. The reaction is completely atom-economical and exhibits a broad scope. Experimental and computational studies support the proposed mechanism and suggest that hydrogen-bonding between the amine-borane and substrates is beneficial to improving the reaction efficiency.
Design, synthesis, and structure-activity relationships of haloenol lactones: Site-directed and isozyme-selective glutathione S-transferase inhibitors
Wu, Zhixing,Minhas, Gurpreet Singh,Wen, Dingyi,Jiang, Hualiang,Chen, Kaixian,Zimniak, Piotr,Zheng, Jiang
, p. 3282 - 3294 (2007/10/03)
Overexpression of glutathione S-transferase (GST), particularly the GST-π isozyme, has been proposed to be one of the biochemical mechanisms responsible for drug resistance in cancer chemotherapy, and inhibition of overexpressed GST has been suggested as an approach to combat GST-induced drug resistance. 3-Cinnamyl-5(E)-bromomethylidenetetrahydro-2-furanone (1a), a lead compound of site-directed GST-π inactivator, has been shown to potentiate the cytotoxic effect of cisplatin on tumor cells. As an initial step to develop more potent and more selective haloenol lactone inactivators of GST-π, we examined the relationship between the chemical structures of haloenol lactone derivatives and their GST inhibitory activity. A total of 16 haloenol lactone derivatives were synthesized to probe the effects of (1) halogen electronegativity, (2) electron density of aromatic rings, (3) molecular size and rigidity, (4) lipophilicity, and (5) aromaticity on the potency of GST-π inactivation. The inhibitory potency of each compound was determined by time-dependent inhibition tests, and recombinant human GST-π was used to determine their inhibitory activity. Our structure-activity relationship studies demonstrated that (1) reactivity of the halide leaving group plays a weak role in GST inactivation by the haloenol lactones, (2) aromatic electron density may have some influence on the potency of GST inactivation, (3) high rigidity likely disfavors enzyme inhibition, (4) lipophilicity is inversely proportional to enzyme inactivation, and (5) an unsaturated system may be important for enzyme inhibition. This work facilitated understanding of the interaction of GST-π with haloenol lactone derivatives as site-directed and isozyme-selective inactivators, possibly potentiating cancer chemotherapy.
Cysteine derivatives as inhibitors for carboxypeptidase A: Synthesis and structure-activity relationships
Park, Jung Dae,Kim, Dong H.
, p. 911 - 918 (2007/10/03)
A series of cysteine (Cys) derivatives having an alkyl or arylalkyl moiety on the α-amino group of the amino acid have been synthesized as a novel type of inhibitor for carboxypeptidase A. These compounds are readily prepared starting with Cys in an optic
Design, synthesis, and structure-activity relationship of 6-alkynylpyrimidines as potent adenosine kinase inhibitors
Gomtsyan, Arthur,Didomenico, Stanley,Lee, Chih-Hung,Matulenko, Mark A.,Kim, Ki,Kowaluk, Elizabeth A.,Wismer, Carol T.,Mikusa, Joe,Yu, Haixia,Kohlhaas, Kathy,Jarvis, Michael F.,Bhagwatt, Shripad S.
, p. 3639 - 3648 (2007/10/03)
Adenosine (ADO) is an extracellular signaling molecule within the central and peripheral nervous system. Its concentration is increased at sites of tissue injury and inflammation. One of the mechanisms by which antinociceptive and antiinflammatory effects of ADO can be enhanced consists of inhibition of adenosine kinase (AK), the primary metabolic enzyme for ADO. Novel nonnucleoside AK inhibitors based on 4-amino-6-alkynylpyrimidines were prepared, and the importance of the length of the linker at the 5-position for high affinity AK inhibition was demonstrated. Compounds with 2- and 3-atom linkers were the most potent AK inhibitors. Optimization of their physicochemical properties led to 31a and 37a that effectively reduced pain and inflammation in animal models.
beta -thiopropionyl-aminoacid derivatives and their use as beta -lactamase inhibitors
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, (2008/06/13)
PCT No. PCT/EP97/00516 Sec. 371 Date Jan. 13, 1999 Sec. 102(e) Date Jan. 13, 1999 PCT Filed Feb. 3, 1997 PCT Pub. No. WO97/30027 PCT Pub. Date Aug. 21, 1997A method of treatment of bacterial infections in humans or animals which comprises administering, in combination with a beta -lactam antibiotic, a therapeutically effective amount of an amino acid derivative of Formula (I) or a pharmaceutically acceptable salt, solvate or in vivo hydrolysable ester thereof, wherein: R is hydrogen, a salt forming cation or an in vivo hydrolysable ester-forming group; R1 is hydrogen, (C1-6)alkyl optionally substituted by up to three halogen atoms or by a mercapto, (C1-6)alkoxy, hydroxy, amino, nitro, carboxy, (C1-6)alkylcarbonyloxy, (C1-6)alkoxycarbonyl, formyl or (C1-6)alkylcarbonyl group, (C3-7)cycloalkyl, (C3-7)cycloalkyl(C2-6)alkyl, (C2-6)alkenyl, (C2-6)alkynyl, aryl, aryl(C1-6)alkyl, heterocyclyl or heterocyclyl(C1-6)alkyl; R2 is hydrogen, (C1-6)alkyl or aryl(C1-6)alkyl; R3 is hydrogen, (C1-6)alkyl optionally substituted by up to three halogen atoms, (C3-7)cycloalkyl, fused aryl(C3-7)cycloalkyl, (C3-7)cycloalkyl(C2-6)alkyl, (C2-6)alkenyl, (C2-6)alkynyl, aryl, aryl-(CHR10)m-X-(CHR11)n, heterocyclyl or heterocyclyl-(CHR10)m-X-(CHR11)n, where m is 0 to 3, n is 1 to 3, each R10 and R11 is independently hydrogen or (C1-4)alkyl and X is O, S(O)x where x is 0-2, or a bond; R4 is hydrogen, or an in vivo hydrolysable acyl group; and R5 and R6 are independently hydrogen and (C1-6)alkyl or together represent (CH2)p where p is 2 to 5. Some compounds are claimed per se.
Phosphinic pseudo-tripeptides as potent inhibitors of matrix metalloproteinases: A structure-activity study
Vassiliou, Stamatia,Mucha, Artur,Cuniasse, Philippe,Georgiadis, Dimitris,Lucet-Levannier, Karine,Beau, Fabrice,Kannan, Rama,Murphy, Gillian,Kn?uper, Vera,Rio, Marie-Christine,Basset, Paul,Yiotakis, Athanasios,Dive, Vincent
, p. 2610 - 2620 (2007/10/03)
Several phosphinic pseudo-tripeptides of general formula R-XaaΨ(PO2- CH2)Xaa'-Yaa'-NH2 were synthesized and evaluated for their in vitro activities to inhibit stromelysin-3, gelatinases A and B, membrane type-1 matrix metalloproteinase, collagenases 1 and 2, and matrilysin. With the exception of collagenase-1 and matrilysin, phosphinic pseudo-tripeptides behave as highly potent inhibitors of matrix metalloproteinases, provided they contain in P1' position an unusual long aryl-alkyl substituent. Study of structure-activity relationships regarding the influence of the R and Xaa' substituents in this series may contribute to the design of inhibitors able to block only a few members of the matrix metalloproteinase family.
