Exploring physicochemical space via a bioisostere of the trifluoromethyl and ethyl groups (BITE): attenuating lipophilicity in fluorinated analogues of Gilenya® for multiple sclerosis
The chemoselective reduction of aldehydes and the tandemhydroformylation–hydrogenation of terminal alkenes are possible with a supramolecularcatalyst that operates by a novel mechanism involving substrate activation by hydrogen bonding and subsequent metal–ligand bifunctional hydrogenation (see scheme).
Intertwining Olefin Thianthrenation with Kornblum/Ganem Oxidations: Ene‐type Oxidation to Furnish α,β‐Unsaturated Carbonyls
作者:Péter Angyal、András M. Kotschy、Ádám Dudás、Szilárd Varga、Tibor Soós
DOI:10.1002/anie.202214096
日期:2023.1.9
A metal-free double oxidation of unactivated alkenes has been developed to deliver unsaturated conjugated carbonyls. This practical procedure allows valorization of the olefinic feedstock with high chemo- and stereoselectivity as demonstrated by the syntheses of difficult-to-access building blocks and industrially relevant pheromones and kairomones.
Validating the 1,2-Difluoro Motif As a Hybrid Bioisostere of CF<sub>3</sub> and Et Using Matrix Metalloproteinases As Structural Probes
作者:Nathalie Erdeljac、Christian Thiehoff、Ravindra P. Jumde、Constantin G. Daniliuc、Sandra Höppner、Andreas Faust、Anna K. H. Hirsch、Ryan Gilmour
DOI:10.1021/acs.jmedchem.0c00648
日期:2020.6.11
Matrix metalloproteinases (MMPs) are involved in a spectrum of physiological processes, rendering them attractive targets for small-molecule drug discovery. Strategies to achieve selective inhibition continue to be intensively pursued, facilitated by advances in structural biology. Herein, we harness MMPs 2, 8, 9, and 13 to validate the vicinal difluoro motif as a hybrid bioisostere of CF3 and Et (BITE) in a series of modified barbiturate inhibitors. Crystallographic analyses of representative structures reveal conformations of the vicinal difluoro motif that manifest stabilizing hyperconjugative interactions consistent with the stereoelectronic gauche effect. Detailed docking studies of a potent difluorinated probe with MMP-9 are also disclosed and indicate that the structural basis of inhibition is a consequence of the anisotropic nature of the motif. Significant selectivity of MMP 13 versus MMP-2 can be achieved by subtle chain contraction in a BITE-modified inhibitor.