strong bases (n-BuLi, s-BuLi/TMEDA, n-BuLi/t-BuOK, TMPMgCl·LiCl, and LDA) reduce the N═N bond of the parent azobenzene (Y = H), aromatic H→Li permutation occurs with LTMP when a suitable director of lithiation (Y = OMe, CONEt2, F) is present in the benzene residue of the azo compound. The method allows direct access to new substituted azobenzenes.
A Convenient, One-Pot Preparative Method for Tri- and Tetrasubstituted Hydrazines from Azobenzenes and Organolithiums
作者:Alan R. Katritzky、Jing Wu、Sergei V. Verin
DOI:10.1055/s-1995-3985
日期:1995.6
Organolithiums add smoothly to the N=N bond of azobenzenes at -78°C to give the lithium derivative of the trisubstituted hydrazine. The corresponding trisubstituted hydrazines, or a variety of unsymmetrically tetrasubstituted hydrazines, were thus conveniently prepared in high yielding one-pot procedures by direct quench, or by treatment of the reaction mixture with an alkyl iodide prior to workup.