Alkylation versus trans-silylation of N-methyl-N-trimethylsilylacetamide with ambident electrophiles (chloromethyl)fluorosilanes
作者:Nataliya F. Lazareva、Nina N. Chipanina、Larisa P. Oznobikhina、Bagrat A. Shainyan
DOI:10.1016/j.jorganchem.2018.09.007
日期:2018.12
cetimidate as ambident substrates to give the products of trans-silylation N-[chloro(difluoro)silyl]methyl}-N-methylacetamide and N-[chloro(fluoro)methylsilyl]methyl}-N-methylacetamide with liberation of Me3SiF, as well as the products of alkylation N-methyl-N-[(trifluorosilyl)methyl]acetamide and N-[difluoro(methyl)silyl]methyl}-N-methylacetamide with liberation of Me3SiCl. The reaction takes place
双官能硅烷CLCH 2的SiF 3和CLCH 2的SiF 2我与反应Ñ -trimethylsilyl- Ñ甲基乙酰胺和它的互变异构体О -trimethylsilyl- N- methylacetimidate作为两可基板,得到的反式-甲硅烷基化的产物Ñ - [氯(二氟)甲基化的Me 3 SiF以及烷基化的N-甲基-N -[(三氟甲硅烷基)甲基化的产物)生成甲硅烷基]甲基} -N-甲基乙酰胺和N -[氯(氟)甲基甲硅烷基]甲基} -N-甲基乙酰胺]乙酰胺和氮-[[二氟(甲基)甲硅烷基]甲基] -N-甲基乙酰胺,并释放Me 3 SiCl。该反应在室温下在诸如CDCl 3,CD 3 CN或己烷的溶剂中进行。在这些条件下,硅烷ClCH 2 SiFMe 2与酰胺仅给出反甲硅烷基化的产物,N -[氯(二甲基)甲硅烷基]甲基} -N-甲基乙酰胺。监测反甲硅烷基化和烷基化的反应,并通过NMR和