Synthesis of Bicyclo[<i>n</i>
.1.0]alkanes by a Cobalt-Catalyzed Multiple C(sp<sup>3</sup>
)−H Activation Strategy
作者:Zhuo-Zhuo Zhang、Ye-Qiang Han、Bei-Bei Zhan、Sai Wang、Bing-Feng Shi
DOI:10.1002/anie.201707638
日期:2017.10.9
cobalt‐catalyzed dual C(sp3)−H activationstrategy has been developed and it provides a novel strategy for the synthesis of bicyclo[4.1.0]heptanes and bicyclo[3.1.0]hexanes. A key to the success of this reaction is the conformation‐induced methylene C(sp3)−H activation of the resulting cobaltabicyclo[4.n.1] intermediate. In addition, the synthesis of bicyclo[3.1.0]hexane from pivalamide, by a triple C(sp3)−H activation
Collision-induced dissociations of carboxylate negative ions from 2-ethylbutanoic, 2-methylpropanoic, and pivalic acids. An isotopic labelling study
作者:Michael B. Stringer、John H. Bowie、Peter C. H. Eichinger、Graeme J. Currie
DOI:10.1039/p29870000385
日期:——
Deprotonation of Et2CHCO2H yields Et2CHCO2–. On collisional activation this ion forms CO2–˙, CH2CH–, and MeCHCH–. In addition, elimination of H˙ and Et˙ yield Et(R)CCO2–˙(R = Et and H, respectively). The elimination of Et˙ is not a simple cleavage but occurs by loss of H˙ from a methyl group followed by loss of ethene. The carboxylateion also rearranges to Et2CCO2H; this species decomposes to HO–, EtCCH2
[EN] COMPOUNDS AS NUCLEAR TRANSPORT MODULATORS AND USES THEREOF<br/>[FR] COMPOSÉS EN TANT QUE MODULATEURS DE TRANSPORT NUCLÉAIRE ET LEURS UTILISATIONS
申请人:XW LAB INC
公开号:WO2019233447A1
公开(公告)日:2019-12-12
Provided are compounds of Formula I'-III', as well as their preparation and uses, and pharmaceutical compositions comprising these compounds and their uses as nuclear transport modulators. Provided are also uses of the compounds or pharmaceutical compositions in treating or preventing certain neurological disorders and diseases as well as certain types of cancer in humans.
Biosynthesis of the polyether antibiotic monensin-a: stereochemical aspects of the incorporation and metabolism of isobutyrate
作者:David Gani、David O'Hagan、Kevin Reynolds、John A. Robinson
DOI:10.1039/c39850001002
日期:——
The incorporation of stereospecifically labelled isotopomers of isobutyrate into monensin-A provides stereochemical and mechanistic information about the bioconversion of isobutyrate into methylmalonyl-CoA and n-butyryl-CoA in Streptomyces cinnamonensis; a rearrangement of isobutyryl-CoA to n-butyryl-CoA occurs without loss of the α-hydrogen, and the carbonyl carbon migrates to the pro-(S) methyl group