Amines<i>vs. N</i>-Oxides as Organocatalysts for Acylation, Sulfonylation and Silylation of Alcohols: 1-Methylimidazole<i>N</i>-Oxide as an Efficient Catalyst for Silylation of Tertiary Alcohols
作者:James I. Murray、Alan C. Spivey
DOI:10.1002/adsc.201500773
日期:2015.12.14
efficiencies of Lewis-basic amines vs. N-oxides for the acylation, sulfonylation and silylation of primary, secondary and tertiary alcohols is reported. Whilst the amines are generally superior to the N-oxides for acylation, the N-oxides are superior for sulfonylation and silylation. In particular, 1-methylimidazole N-oxide (NMI-O) is found to be a highly efficient catalyst for sulfonylation and silylation reactions
报道了路易斯-伯胺和N-氧化物对伯,仲和叔醇的酰化,磺酰化和甲硅烷基化的相对催化效率的比较。虽然胺通常是优于Ñ -oxides为酰化,所述Ñ -oxides优于用于磺酰化和甲硅烷基化。特别地,发现1-甲基咪唑N-氧化物(NMI-O)是用于磺酰化和甲硅烷基化反应的高效催化剂。据我们所知,NMI-O是第一种胺或N-氧化物路易斯碱性有机催化剂,能够在温和的反应条件下以较低的催化剂负载量高产率地促进叔醇的高效甲硅烷基化。