Tris(pentafluorophenyl)borane-catalyzed silylative reduction of pyridines has been developed giving rise to the formation of sp(3) C-Si bonds selectively beta to the nitrogen atom of azacyclic products. Depending on the position and nature of pyridine substituents, structurally diverse azacycles are obtained with high selectivity under the borane catalysis. Mechanistic studies elucidated the sequence
已开发出三(
五氟苯基)
硼烷催化的
吡啶甲
硅烷基化还原,从而形成 sp(3) C-Si 键选择性地β到氮杂环产品的氮原子。根据
吡啶取代基的位置和性质,在
硼烷催化下以高选择性获得结构多样的氮杂环。机理研究阐明了这种多重还原级联中氢化
硅烷化的顺序:1,2- 或 1,4- 氢化
硅烷化作为初始步骤,具体取决于取代基位置,然后选择性氢化
硅烷化烯胺双键,最终得到 β-
硅烷化氮
杂环化合物。