Schmidt reaction by sulfonium ions is described. General primary, secondary, and tertiary alkyl azides were converted to the corresponding carbonyl or imine compounds without any trace of the activators. This bond scission reaction through 1,2-migration of C–H and C–C bonds was accessible to the one-pot substitution reaction.
Bongkrekic Acid Analogue, Lacking One of the Carboxylic Groups of its Parent Compound, Shows Moderate but pH-insensitive Inhibitory Effects on the Mitochondrial ADP/ATP Carrier
Bongkrekicacid, isolated from Burkholderia cocovenenans, is known to specifically inhibit the mitochondrial ADP/ATP carrier. However, the manner of its interaction with the carrier remains elusive. In this study, we tested the inhibitory effects of 17 bongkrekicacid analogues, derived from the intermediates obtained during its totalsynthesis, on the mitochondrial ATP/ATP carrier. Rough screening
Elucidation of the stereostructure of the annonaceous acetogenin (+)-montecristin through total synthesis
作者:Christian Harcken、Reinhard Brückner
DOI:10.1039/b002905j
日期:——
Total syntheses of ent-5-epi-montecristin (1a) and of (−)-montecristin (1b) were accomplished. The stereocenters of compounds 1a and 1b were established by asymmetric dihydroxylations of the trans-configurated β,γ-unsaturated esters 6 ( → 4, up to 80% ee; Scheme 3; improved procedure with up to 94% ee: Scheme 7) and 56 ( → 55, 97% ee: Scheme 9) while the stereogenic CC bonds stem from the carbocuprations
were then evaluated. All tested tricarboxylic acidderivatives including BKA showed little toxicity against HeLa cells. BKA and two of the synthesized derivatives significantly suppressed staurosporine (STS)-induced reductions in cell viability. Furthermore, STS-induced ΔΨm collapse was significantly restored by pretreatment with BKA and a tricarboxylic acidderivative. Other derivatives, in which
Development of Hybrid Phospholipid Mimics as Effective Agonists for Liver Receptor Homologue-1
作者:Autumn R. Flynn、Suzanne G. Mays、Eric A. Ortlund、Nathan T. Jui
DOI:10.1021/acsmedchemlett.8b00361
日期:2018.10.11
for metabolic disorders. The most effective known LRH-1 modulators are phospholipids or synthetic hexahydropentalene compounds. While both classes have micromolar efficacy, they target different portions of the ligand binding pocket and activate LRH-1 through different mechanisms. Guided by crystallographicdata, we combined aspects of both ligand classes into a single scaffold, resulting in the most