Trichloromethyltrimethylsilane, Sodium Formate, and Dimethylformamide: A Mild, Efficient, and General Method for the Preparation of Trimethylsilyl-Protected 2,2,2-Trichloromethylcarbinols from Aldehydes and Ketones
作者:Jérémy Kister、Charles Mioskowski
DOI:10.1021/jo070180w
日期:2007.5.1
preparation of trimethylsilyl-protected 2,2,2-trichloromethylcarbinols 2 from aldehydes and ketones are reported. Compounds 2, which are important intermediates in organic synthesis, were obtained in excellent yields by use of a combination of trichloromethyltrimethylsilane (TMSCCl3), and a catalytic amount of sodium formate (HCOONa) in dimethylformamide (DMF). Substrates bearing highly sensitive protecting
报道了从醛和酮制备三甲基甲硅烷基保护的2,2,2-三氯甲基羰基化合物2的新条件。通过使用三氯甲基三甲基硅烷(TMSCCl 3)和催化量的甲酸钠(HCOONa)在二甲基甲酰胺(DMF)中的组合,以优异的产率获得了化合物2,这是有机合成中的重要中间体。带有高度敏感的保护基的底物已经成功地经受了我们的条件。我们还描述了一种一锅法,可以直接进入2,2,2-三氯甲基卡宾醇3。这种方法避免了通常使用3的合成所需要的强碱( Wyvratt et al。J.Org。化学。1987年,52,944; Aggarwal和Mereu,J。Org。化学。2000,65,7211)。