Synthesis of 8-Substituted Xanthines and Their Oxidative Skeleton Rearrangement to 1-Oxo-2,4,7,9-tetraazaspiro[4,5]dec-2-ene-6,8,10-triones
作者:Hans Zimmer、Adel Amer、Frank M. Baumann、Michael Haecker、Christopher G. M. Hess、Douglas Ho、Hans J. Huber、Klaus Koch、K. Mahnke、Christian Schumacher、Robert C. Wingfield
The synthesis of a number of 8-(dialkylamino)- and 8-alkoxyxanthines (3 and 6, respectively) is described. Treatment of 3 with m-chloroperoxybenzoic acid (m-CPBA) gave by a novel rearrangement 3-(disubstituted amino)-4,7,9-trimethyl-1-oxo-2,4,7,9-tetraazaspiro[4,5]dec-2-ene-6,8,10-triones 10. Also, the corresponding 3-alkoxy-subtituted spiro compounds 12 were obtained by an analogus treatment of 8-alkoxyxanthines