Enantioselective Synthesis of 3,4-Dihydroisoquinolin-1(2<i>H</i>)-ones by Nickel-Catalyzed Denitrogenative Annulation of 1,2,3-Benzotriazin-4(3<i>H</i>)-ones with Allenes
A denitrogenative annulationreaction of 1,2,3-benzotriazin-4(3H)-ones with allenes catalyzed by a nickel-phosphine complex to produce a variety of substituted 3,4-dihydroisoquinolin-1(2H)-ones in a regioselective manner is described. A highly enantioselective version, as well as structural evidence for the mechanistic course of this reaction, is also presented.
methodology. Molecular structure of a representative compound was confirmed by single crystal X-ray diffraction study. The scope and limitations of this reaction is discussed. Some of the compounds synthesized were tested for chorismatemutase inhibitory properties in vitro. The in vitro dose response study of an active compound is presented.
1,2,3-Benzotriazin-4(3H)-ones react with 1,3-dienes in the presence of a nickel(0)/phosphine complex to give a variety of 3,4-dihydroisoquinolin-1(2H)-ones. Oxidative insertion of nickel(0) into the triazinone moiety prompts extrusion of dinitrogen to give a five-membered ring azanickelacyclic intermediate. Subsequent insertion of 1,3-dienes into the nickel−carbon bond followed by allylic amidation
Visible-light-induced denitrogenative phosphorylation of benzotriazinones: a metal- and additive-free method for accessing <i>ortho</i>-phosphorylated benzamide derivatives
3-benzotriazinones was achieved. With the use of eosin Y as a photoredox catalyst, N,N-diisopropylethylamine as a base, CH3CN–H2O as a solvent and sunlight or a blue LED as a light source, a variety of aryl-phosphonates, aryl-phosphinates, and aryl-phosphine oxides were efficiently prepared. In addition, B2pin2 instead of P-nucleophiles as a radical acceptor was also demonstrated. The key advantages of this
作者:A. J. Boulton、Purabi Devi、Neil Henderson、Adil A. Jarrar、Mikl�s Kiss
DOI:10.1039/p19890000543
日期:——
3-Substituted 1,2,3-benzotriazin-4(3H)-one 1-oxides are formed on peracid oxidation of 3-alkyl- and 3-methoxy-1,2,3-benzotriazin-4(3H)-ones. The 3-(α-alkoxyalkyl) 1-oxide derivatives could be dealkylated to the tautomeric 3-unsubstituted compound. The acidities of the isomeric N-oxides of the 1,2,3-benzotriazinone system are compared. Phenyl iodosodiacetate converts o-nitrobenzaldehyde benzyl- and