96017-59-3Relevant articles and documents
Direct β- and γ-C(sp3)?H Alkynylation of Free Carboxylic Acids**
Ghiringhelli, Francesca,Ghosh, Kiron Kumar,Uttry, Alexander,van Gemmeren, Manuel
supporting information, p. 23127 - 23131 (2020/10/15)
In this study we report the identification of a novel class of ligands for palladium-catalyzed C(sp3)?H activation that enables the direct alkynylation of free carboxylic acid substrates. In contrast to previous synthetic methods, no introduction/removal of an exogenous directing group is required. A broad scope of acids including both α-quaternary and challenging α-non-quaternary can be used as substrates. Additionally, the alkynylation in the distal γ-position is reported. Finally, this study encompasses preliminary findings on an enantioselective variant of the title transformation as well as synthetic applications of the products obtained.
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.
Antiproliferative and neurotrophic molecules
-
, (2008/06/13)
Neurotrophic and antiproliferative compounds related to the antiepileptic drug valproate are provided. These compounds are useful for promoting neuronal function as in neurodegenerative disorders and for treating neoplastic disease.
Antiproliferative and neurotrophic molecules
-
, (2008/06/13)
Neurotrophic and antiproliferative compounds related to the antiepileptic drug valproate are provided. These compounds are useful for promoting neuronal function as in neurodegenerative disorders and for treating neoplastic disease.