An umpolung sulfoxide reagent for use as a functionalized benzyl carbanion equivalent
作者:Giovanni Pinna、Maria Cristina Bellucci、Luciana Malpezzi、Laura Pisani、Stefano Superchi、Alessandro Volonterio、Matteo Zanda
DOI:10.1016/j.tet.2011.05.033
日期:2011.7
and α-acetammido benzyl carbanions by means of a two-step sequence involving highly diastereoselective α-C-alkylation with alkyl halides followed by displacement of the sulfinyl residue (which can be recovered and recycled) by a hydroxyl, a chlorine or an acetamido, respectively, under non-oxidative Pummerer conditions. The scope and limits of the method, including a stereoselective version of the
N-甲基邻氨基甲酰基芳基苄基亚砜可以用作两步序列,包括高度非对映选择性的α-C-烷基化和烷基卤化物,然后用作α-羟基,α-氯和α-乙酰氨基苄基碳负离子的合成等价物。在非氧化Pummerer条件下,分别通过羟基,氯或乙酰氨基置换亚磺酰基残基(可回收和再循环)。详细讨论了该方法的范围和限制,包括反应的立体选择形式以及该方法的机理。