[EN] TROPOLONE DERIVATIVES AND TAUTOMERS THEREOF FOR IRON REGULATION IN ANIMALS [FR] DÉRIVÉS DE TROPOLONE ET LEURS TAUTOMÈRES POUR LA RÉGULATION DU FER CHEZ LES ANIMAUX
Electrocyclic ring opening of a .beta.-lithiocyclopropyloxirane. Generation and trapping of (2Z,4E)-cyclohepta-2,4-dienol
作者:Robert M. Coates、Larry A. Last
DOI:10.1021/ja00363a020
日期:1983.11
La metallation de l'anti-oxyde de l'exo-bromo-7 bicyclo [4.1.0] heptene-2(I) avec le butyllithium a 0°C donne l'exo-bicyclo [3.2.0] heptene-6ol-2(II). Un mecanisme faisant intervenir une decyclisation conrotatoire du cyclopropane metalle en cycloheptadiene-2,4 olate suivie d'une cyclisation conrotatoire est propose pour expliquer la formation de II
La metallation de l'anti-oxyde de l'exo-bromo-7 bicyclo [4.1.0] heptene-2(I) avec le 丁基锂 a 0°C donne l'exo-bicyclo [3.2.0] heptene-6ol- 2(二)。Un mecanisme faisant intervenir une decyclisation conrotatoire du cyclopropane metalle en cycloheptadiene-2,4 olate suivie d'une cyclisation conrotatoire est proposal pour expliquer la Formation de II
[EN] DISULFIDE BIOCONJUGATION<br/>[FR] BIOCONJUGAISON DE DISULFURE
申请人:UNIV CALIFORNIA
公开号:WO2018201000A1
公开(公告)日:2018-11-01
Compounds and methods are provided for one-step functionalization of disulfide bonds in proteins.
1-dibromo-2-vinylcyclopropane derivatives with MeLi yielded cyclopentadienes as the main products together with small amounts of allenic compounds (Table 1). By the same reaction 2,2,2′,2′-tetrabromobicyclopropyl derivatives yielded, in all but one case, only small amounts of diallenes; the exception is the exclusive formation of 2,7-dimethyl-2,3,5,6-octatetraene, (XIII) from2,2,2′,2′-tetrabromo-3,3,3′,
in a nonconcerted fashion, from the bicyclicmethylenecyclopropanes 26, 30, 33, and 40, through the planar diradicals 28, 31, 35, and 50, respectively. The different reaction modes are viewed as being caused by the different coupling probabilities of the underlying vibrations. The orthogonal or planar geometries of the diradicals were derived from stereochemical and kinetic arguments. Additional thermodynamic
In order to obtain a scope and limitations of the reaction for newly developed tropone synthesis, some substituted 2,3- and 3,4-epoxy-7,7-dihalobicyclo[4.1.0]heptanes have been prepared and treated with several acids. We found that (1) the epoxy-carbons of starting materials should have, at least, one substituent which may stabilize the carbenium ion formed by cleavage of the epoxide with acid, (2)