Carbonylation of quaternary ammonium salts to tertiary amides using NaCo(CO)4 catalyst
作者:Yizhu Lei、Rui Zhang、Qing Wu、Hui Mei、Bo Xiao、Guangxing Li
DOI:10.1016/j.molcata.2013.10.014
日期:2014.1
the catalytic carbonylation of quaternary ammonium salts under anhydrous condition. Quaternary ammonium salts, a kind of versatile reagents that were widely used in organometallic chemistry, can be carbonylated to tertiary amides by an in situ prepared NaCo(CO)4 catalyst. It was found that the counterions (Cl−, Br−, I−, OTf−) in the quaternary ammonium salts played a significant role in the reaction
我们在这里报道了在无水条件下季铵盐的催化羰基化反应。季铵盐是一种广泛用于有机金属化学的通用试剂,可通过原位制备的NaCo(CO)4催化剂羰基化为叔酰胺。结果发现,该抗衡离子(CL - ,溴- ,我- ,光学传递函数- )在季铵盐中的反应中发挥了作用显著和碘化四甲基铵可以给的高产率(96%)Ñ,Ñ-仅含0.5摩尔%钴催化剂的-二甲基乙酰胺(DMAc)。在最佳条件下,其他几种季铵碘化物也以中等至极好的收率被羰基化为相应的叔酰胺。显然,这些结果也使我们特别理解,Me 4 NI和其他季铵盐在羰基化反应中可能被羰基化为叔酰胺,在大多数情况下它们被用作促进剂或溶剂。考虑到高活性和中等至优异的选择性,该方法可能是合成某些叔酰胺的潜在方法。此外,详细讨论了CN键的裂解机理和可能的催化中间体。