Ammonia borane as a metal free reductant for ketones and aldehydes: a mechanistic study
作者:Xianghua Yang、Thomas Fox、Heinz Berke
DOI:10.1016/j.tet.2011.06.104
日期:2011.9
Without a catalyst ketones and aldehydes were reacted in THF with ammonia borane (AB) to proceed hydroboration forming alkyl borates. Mechanistic studies revealed that dissociation of ammonia from AB occurred before the hydroboration step. When methanol was used as the solvent, metal free methanolysis of AB would take place with the ketone/aldehyde being directly hydrogenated by the MeOH·BH3 complex
在没有催化剂的情况下,酮和醛在THF中与氨硼烷(AB)反应,进行硼氢化反应,生成烷基硼酸酯。机理研究表明,在硼氢化步骤之前,氨从AB中解离出来。当使用甲醇作为溶剂时,AB的无金属甲醇分解反应将通过MeOH·BH 3络合物将酮/醛直接氢化。