摘要
N,N-二甲基氨甲酰基三甲基硅烷与一系列α-羰基酯在无水无氧、60℃、甲苯作溶剂的条件下反应,合成了α-三甲基硅氧基-α-烷氧羰基酰胺衍生物,收率70%~99%.当α-羰基酯的酯基是含有手性碳的L-薄荷醇酯基时,发现反应具有一定的立体选择性.通过研究反应的影响因素发现,芳环上取代基的性质影响反应的速率和产物的产率.反应所得产物的结构用元素分析、1H NMR、13C NMR和IR等方法进行了表征.提出了可能的反应机理.该反应具有条件温和、副产物少、产物得率高和后处理简单等优点,是有效合成α-烷氧羰基-α-羟基酰胺的新方法.
N,N-Dimethylcarbamoyl（trimethyl）silane reacted with a series of α-ketoesters in anhydrous toluene at 60 ℃ to afford α-alkoxycarbonyl-α-siloxy amide derivatives in good yields（70%~99%）. When the alkyl of α-ketoesters was L-2-isopropyl-5-methylcyclohexyl, the reactions possess stereo selectivity. The experimental results showed that the electronic property of the substituted group on the aryl ring affected both the reaction ratio and the yields of products. The structures of the products were characterized by element analysis, 1H NMR, 13 C NMR and IR spectra. A reaction mechanism is proposed. The mild and no catalyst conditions, simple procedure, less byproducts and good yields provide an effective method for the preparation of α-alkoxycarbonyl-α-hydroxy amides.
作者
李伟东
韩生华
刘艳红
陈建新
Li Weidonga Han Shenghua Lui Yanhong Chen Jianxin(College of Chemistry and Material Science, Shanxi Normal University, Linfen 041004 College of Chemistry and Engineering, Shanxi Oatong University, Oatong 037009)
出处
《有机化学》
SCIE
CAS
CSCD
北大核心
2017年第9期2423-2429,共7页
Chinese Journal of Organic Chemistry
基金
山西省留学回国人员基金(No.0713)
山西省自然科学基金(No.2012011046-9)
山西师范大学文理学院基金(No.WL2016CXCY-YJ-30)资助项目~~
