Byproducts in the preparation of penta-O-acetyl-d-hexononitriles from d-galactose and d-glucose
作者:Richard H. Furneaux
DOI:10.1016/0008-6215(83)88240-8
日期:1983.3
is generally assumed. Instead, N -hydroxy- d -glycosylamine hexaacetates are formed as byproducts, in part by a kinetically controlled ring-closure of the sugar oxime, concomitant with acetylation. From preparative isolation of the products, d -galactose gave the nitrile (67%), and the β-furanose (16%), α-furanose (1%), and β-pyranose (2%) isomers of the cyclic hexaacetate, whereas d -glucose gave
摘要制备用于glc分析的d-半乳糖和d-葡萄糖的过-O-乙酰化醛醇腈衍生物的常用方法包括肟的形成和乙酰化。但是,它们并不像通常认为的那样将腈作为唯一的产品。相反,N-羟基-d-糖基胺六乙酸盐是作为副产物形成的,部分是通过糖肟的动力学控制的闭环以及乙酰化而形成的。从产物的制备分离中,d-半乳糖得到了环六乙酸盐的腈(67%)和β-呋喃糖(16%),α-呋喃糖(1%)和β-吡喃糖(2%)异构体,而d-葡萄糖生成腈(63%),β-呋喃糖(14%)和β-吡喃糖(8%)异构体。