An efficient large-scale synthesis of gemcitabine employing a crystalline 2,2-difluoro-α-ribofuranosyl bromide
作者:Young-Kil Chang、Jaeheon Lee、Gha-Seung Park、Moonsub Lee、Chul Hyun Park、Han Kyong Kim、Gwansun Lee、Bo-Young Lee、Ju Yuel Baek、Kwan Soo Kim
DOI:10.1016/j.tet.2010.05.039
日期:2010.7
An efficient large-scalesynthesis of gemcitabine was achieved without chromatography or fractional crystallization. The key steps include stereospecific conversion of a novel β-ribofuranosyl phosphate into a highly crystalline α-ribofuranosyl bromide and coupling of the α-ribofuranosyl bromide and trimethylsilyl cytosine to produce a β-nucleoside. p-Phenylbenzoyl group was introduced for the protection