Reaction of hydroxyamide-functionalized azolium salt with Ag2O: Three different transformations
作者:Kyohei Kamiguchi、Satoshi Sakaguchi
DOI:10.1016/j.jorganchem.2020.121556
日期:2020.12
We report three different transformations in the reaction of the hydroxyamide-functionalized azolium chloride 1 with Ag2O. These transformations were controlled by the N-substituent at the azolium ring of 1. Treatment of 1c (R = Me, alkyl) with Ag2O afforded the corresponding monodentate NHC-Ag (NHC represents N-heterocyclic carbene) complex, 6c, in 95% yield. In contrast, the reaction of 1b (R = Ph
我们报道了在羟酰胺官能化的氯化azo 1与Ag 2 O反应中的三种不同转化。这些转化受1的lium环上的N-取代基控制。用Ag 2 O处理1c(R = Me,烷基),得到95c收率的相应单齿NHC-Ag(NHC代表N-杂环卡宾)配合物6c。相反,1b(R = Ph,芳基)与Ag 2 O反应生成相应的2-羟基恶唑烷取代的氢氧化偶氮鎓7b,产率为90%。在该转化中,也许1b的羟酰胺部分环化为2-羟基恶唑烷在氢氧根抗衡阴离子的影响下发生。几种芳基取代的偶氮氯化物1d - f也被转化为相应的环化产物7d - f。然而,1h(R = 2,4,6-Me 3 C 6 H 2,芳基)与Ag 2 O的反应得到了相应的NHC-Ag络合物6h,产率为93%,而1i(R = 4-MeOC 6H 4,芳基)与Ag 2 O的混合物分别提供6i和7i的混合物,产率为56%和32%。此外,研究了在芳基侧臂的邻位具有更受空间阻碍的取代基的氯化偶氮氯化物1j(R