Cyclic (E)-β-trimethylsilylketoxime acetates were effectively cleaved by a catalytic action of trimethylsilyl trifluoromethanesulfonate to give the corresponding unsaturated nitriles. The fragmentation in the Beckmann rearrangement is completely controlled and directed by trimethylsilyl group to lead regio- and stereospecific formation of the double bond.
环状(E)-β-三甲基甲
硅烷基酮
肟乙酸酯可通过三甲基甲
硅烷基
三氟甲磺酸酯的催化作用有效裂解,得到相应的不饱和腈。贝克曼重排中的断裂完全由三甲基甲
硅烷基控制和引导,从而导致双键的区域和立体特异性形成。