REACTIONS OF AN OVERCROWDED SILYLENE WITH PYRIDINES: FORMATION OF A NOVEL 2H-1,2-AZASILEPINE AND ITS FURTHER CYCLO ADDITION

摘要

The reactions of an overcrowded silylene [Tbt(Mes)Si:] with two types of pyridines were performed. In the case using pyridine, a unique 2:2 adduct bearing five, six, and seven-membered rings was obtained. On the other hand, the reaction with N,N-dimethyl-4-aminopyridine (DMAP) afforded the corresponding 1:1 adduct having a 2H-1,2-azasilepine skeleton.