Stereocontrolled halofluorination of glycals with silicon tetrafluoride, leading to a facile synthesis of glycosyl fluorides
作者:Makoto Shimizu、Yuko Nakahara、Hirosuke Yoshioka
DOI:10.1016/s0022-1139(99)00026-3
日期:1999.7
Bromofluorination of glycals was carried out with SiF4, 1,3-dibromo-5,5-dimethylhydantoin (DBH), and H2O in 1,4-dioxane in the presence of HMPA to give bromofluoro sugars in good yields with good selectivities. Subsequent debromination with n-Bu3SnH gave 2-deoxy sugars in good yields. Furthermore, hydroxyfluorination of glycal was also successfully conducted using SiF4-PhI(OAc)2-H2O to give fluoroglucose
烯糖的Bromofluorination用的SiF进行4,1,3-二溴-5,5-二甲基海因(DBH),和H 2 ö在HMPA存在1,4-二恶烷,得到良好的收率与好的选择性bromofluoro糖。随后用n -Bu 3 SnH脱溴得到2-脱氧糖,收率良好。此外,还使用SiF 4 -PhI(OAc)2 -H 2 O成功地进行了糖基的羟基氟化,以73%的收率得到了氟葡萄糖。