Palladium-catalyzed copper(I)-mediated cross-coupling reaction of 3-methylthio-6-(morpholin-4-yl)-1,2,4,5-tetrazine with a wide range of boronic acids and organotin derivatives led to new unsymmetrical aryl- and hetaryl-substituted tetrazines in moderate to good yields. These results represent the first cross-coupling reactions of readily available 3-methylthiotetrazine under Suzuki-like and Stille-like conditions and could extend the scope of tetrazine chemistry.
Conjugated systems built by connecting one electron-donor triphenylamine to an electron-withdrawing tetrazine have been prepared using various linkers.
Preparation and inverse electron demand Diels-Alder reactions of 3-methoxy-6-methylthio-1,2,4,5-tetrazine
作者:Subas M. Sakya、Kelley K. Groskopf、Dale L. Boger
DOI:10.1016/s0040-4039(97)00751-x
日期:1997.6
The selective preparation of 3-methoxy-6-methylthio-1,2,4,5-tetrazine (2) and 3,6-dimethoxy-1,2,4,5-tetrazine (3) from 3,6-bis(methylthio)-1,2,3,5-tetrazine (1) is described. A preliminary investigation into the participation of 2 in [4+2] cycloaddition reactions with electron rich and neutral dienophiles along with the resulting regioselective formation of the products (5) are discussed. (C) 1997 Elsevier Science Ltd.