Cationic iridium complex is a new and efficient Lewis acid catalyst for aldol and Mannich reactions
作者:Gen Onodera、Takayuki Toeda、Nou-no Toda、Daigo Shibagishi、Ryo Takeuchi
DOI:10.1016/j.tet.2010.09.015
日期:2010.11
A cationic iridium complex [Ir(cod)2]SbF6 was found to be a new and efficient Lewis acid catalyst for Mukaiyama aldol and Mannich reactions. Aldehydes react smoothly with silyl enol ethers to give β-siloxy ketones in the presence of 0.5 mol % of [Ir(cod)2]SbF6. The reaction of N-alkyl arylaldimines with ketene silyl acetals in the presence of 5 mol % [Ir(cod)2]SbF6/P(OPh)3 gave β-amino esters. After
发现阳离子铱络合物[Ir(cod)2 ] SbF 6是用于Mukaiyama aldol和Mannich反应的新型高效路易斯酸催化剂。醛在0.5摩尔%[Ir(cod)2 ] SbF 6的存在下与甲硅烷基烯醇醚平稳反应,生成β-甲硅烷氧基酮。在5mol%[Ir(cod)2 ] SbF 6 / P(OPh)3的存在下,N-烷基芳基醛亚胺与乙烯酮甲硅烷基缩醛的反应得到β-氨基酯。在曼尼希反应完成后,将反应混合物搅拌24小时导致环化,得到β-内酰胺。N的反应苯乙二胺与芳基苯甲二胺与由苯乙酮衍生的甲硅烷基烯醇醚得到的四氢喹啉衍生物为单一的非对映异构体。