Reduction of acetylsilane 0-silylcyanohydrins gave P-amino-a-hydroxysilanes, which were diazotized to give a-silyl ketones. The addition of organolithium reagents to the cyanohydrins was accompanied by sequential CN and 0-N silyl group migrations. Silylation of the resulting lithium enolates afforded P-siloxy-N, N-bissilylenamines.