CeCl3˙7H2O: A Versatile and Efficient Reagent for the Synthesis of C-Pyrrolyl Glycosides
作者:Basi Reddy、Ruchi Jain、Kudikyala Bhargavi、Manisha Swain、Jhillu Yadav
DOI:10.1055/s-0030-1258369
日期:2011.1
1,3-Diketones and β-oxo esters undergo smooth coupling with d-glucosamine in the presence of 25 mol% CeCl3˙7H2O in water at 80 ˚C to furnish C-pyrrolyl glycosides in good to high yields. The reaction of cyclic diketones such as dimedone with d-glucosamine affords the corresponding 2-(3,4-dihydroxytetrahydrofuran-2-yl)-6,7-dihydro-1H-indol-4(5H)-one derivatives. These dihydroxy derivatives are directly
1,3-二酮和β-氧代酯在80°C的水中存在25 mol%CeCl 3 7 H 2 O的条件下与d-葡萄糖胺进行平滑偶联,从而以良好或高收率提供C-吡咯烷基糖苷。环状二酮如二甲基酮与d-葡萄糖胺的反应得到相应的2-(3,4-二羟基四氢呋喃-2-基)-6,7-二氢-1 H-吲哚-4(5 H)-一衍生物。使用乙酸酐和4-(二甲基氨基)吡啶将这些二羟基衍生物直接转化为乙酸酯。使用容易获得的加入CeCl的3 7H 2 ö使得这个过程相当简单,方便和实用的。 C-吡咯基糖苷-1,3-二酮-氨基葡萄糖-铈(III)盐