Reaction of sugar thiocyanates with Grignard reagents. New synthesis of thioglycosides.
作者:Zbigniew Pakulski、Donat Pierożyński、Aleksander Zamojski
DOI:10.1016/s0040-4020(01)87009-5
日期:1994.2
Glycosyl thiocyanates having hydroxyl groups protected with acetyl or benzoyl groups react readily at −40°C with Grignard reagents to afford the corresponding alkyl or aryl thioglycosides in good yields. Monosaccharide derivatives having the SCN grouping at other positions form under similar conditions thioethers. Axial thiocyanates do not react. Elevated temperatures induce side reactions leading
在-40℃下,具有被乙酰基或苯甲酰基保护的羟基的糖基硫氰酸氰酸酯易于与格氏试剂反应,以高收率得到相应的烷基或芳基硫代糖苷。在相似条件下形成在其他位置具有SCN基团的单糖衍生物可形成硫醚。轴向硫氰酸盐不反应。升高的温度引起副反应,导致硫醇。