[EN] 1-a-HALO-2,2-DIFLUORO-2-DEOXY-D-RIBOFURANOSE DERIVATIVES AND PROCESS FOR THE PREPARATION THEREOF [FR] DERIVES DE 1-?-HALO-2,2-DIFLUORO-2-DESOXY-D-RIBOFURANOSE ET PROCEDE DE PREPARATION DE CEUX-CI
Method for the Preparation of 2'-Deoxy-2',2'-Difluorocytidine
申请人:Lee Jaeheon
公开号:US20070249818A1
公开(公告)日:2007-10-25
This invention relates to an improved method for stereoselectively preparing 2¢¥-deoxy-2¢¥,2¢¥-difluorocytidine of formula (I), which comprises the steps of reacting a 1-halo ribofuranose compound of formula (III) with a nucleobase of formula (IV) in a solvent to obtain a nucleoside of formula (II) with removing the silyl halide of formula (V) produced during the reaction; and deprotecting the nucleoside of formula (II) to obtain 2¢¥-deoxy-2¢¥,2¢¥-difluorocytidine of formula (I).
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
[EN] 1-a-HALO-2,2-DIFLUORO-2-DEOXY-D-RIBOFURANOSE DERIVATIVES AND PROCESS FOR THE PREPARATION THEREOF<br/>[FR] DERIVES DE 1-?-HALO-2,2-DIFLUORO-2-DESOXY-D-RIBOFURANOSE ET PROCEDE DE PREPARATION DE CEUX-CI
申请人:HANMI PHARM IND CO LTD
公开号:WO2006011713A1
公开(公告)日:2006-02-02
1-α-halo-2,2-difluoro-2-deoxy-D-ribofuranose derivative of formula (I) having the 3-hydroxy group protected with a biphenylcarbonyl group is a solid which can be easily purified by a simple procedure such as recrystallization, and therefore, it can be advantageously used as an intermediate in the preparation of gemcitabine in a large scale. Further, the 1-α-halo-2,2-difluoro-2-deoxy-D-ribofuranose derivative of formula (I) can be prepared with high stereoselectivity using the compound of formula (V) as an intermediate.