A convenient and efficient preparation of β-substituted α-haloenones from diazodicarbonyl compounds
作者:Yong Rok Lee、Bang Sub Cho、Hyuk Jin Kwon
DOI:10.1016/j.tet.2003.09.087
日期:2003.11
Rhodium(II)-catalyzed reactions of cyclic diazodicarbonyl compounds with a variety of halides have been examined. With acid halides, β-acyloxy α-haloenones are produced in good yields. With benzyl halides, β-benzyloxy α-haloenones are obtained in good yields. Reactions with methylene halides yield β-halomethoxy α-haloenones in good yields, whereas reactions with ethyl halides and ethylene dihalides
A novel and efficient multicomponent reaction of cyclic 2-diazo-1,3-diketones, carbodiimides, and 1,2-dihaloethanes has been developed, and it leads to unsymmetrical urea derivatives with good yields in a single operation. This transformation involves the cascade formation of C–X (X = Cl, Br, I), C–N and CO bonds through halogenation, nucleophilic addition, ring-opening, and enol–ketone tautomerization
Production mechanism of active species on the oxidative bromination following perhydrolase activity
作者:Hideyasu China、Yutaka Okada、Hiroyasu Ogino
DOI:10.1002/poc.3490
日期:2016.2
Hypobromous acid and molecular bromine have been described as the active species involved in the oxidativebrominationusing perhydrolase, which catalyzes the reaction from acetic acid and hydrogen peroxide to peracetic acid (AcOOH). However, the brominating activity of them in a chemical model system was lower than that of the active species produced by the spontaneous reaction between AcOOH and Br−