and convenient synthetic protocols based on H-phosphonate chemistry have been developed for the preparation of nucleoside 5′-diphosphates. It consists of oxidation of the silylated H-phosphonate monoesters in pyridine with iodine to produce the corresponding N-pyridiniumphosphonate intermediates, followed by their reactions with orthophosphoric acid used as a nucleophile. The added value of the method
describe a chemo-enzymatic synthesis of modified nucleosidesthrough lipase-catalyzed hydrolysis of their peracetylatedprecursors. It was found from screening of a large number of substrates that these enzymes' regioselectivities were affected by the sugar and the nucleobase structures. By selecting the best enzyme for each substrate in terms of activity and regioselectivity, we prepared a small library
Immobilization of Neutral Protease from Bacillus subtilis for Regioselective Hydrolysis of Acetylated Nucleosides: Application to Capecitabine Synthesis
resulted in very stable enzyme derivatives. In an attempt to explain the obtained enzyme immobilization results, the hypothetical localization of lysines on the enzyme surface was predicted in a 3D structure model of B. subtilis protease N built in silico by using the structure of Staphylococcus aureus metalloproteinase as the template. The immobilized enzyme shown a high regioselectivity in the hydrolysis
本文介绍了枯草芽孢杆菌中性蛋白酶的固定化及其在乙酰化核苷的区域选择性水解中的应用,包括可用于制备抗癌产品的构建块。关于固定研究,根据固定程序获得了不同的结果。环氧疏水性载体产生一种稳定性差的衍生物,在所需的反应条件下释放出几乎 50% 的固定蛋白。相反,共价固定在不同活化的亲水性载体(琼脂糖)上会产生非常稳定的酶衍生物。为了解释获得的酶固定化结果,赖氨酸在酶表面的假设定位在 B. 的 3D 结构模型中进行了预测。subtilis protease N 以金黄色葡萄球菌金属蛋白酶的结构为模板,在硅片上构建。固定化酶在水解不同的全乙酰化核苷时显示出高区域选择性。获得了一种稳定的酶衍生物,并成功地用于开发用于水解乙酰化核苷的高效制备型生物工艺,为高产率合成卡培他滨提供了新的中间体。
Process for producing nucleoside derivatives
申请人:Sumitomo Chemical Company, Limited
公开号:EP0894868A2
公开(公告)日:1999-02-03
There is disclosed a process for producing a nucleoside derivative of the formula [I]:
characterized by contacting 2',3',5'-O-triacylribonucleoside derivative of the formula [II]:
with an ester hydrolase:
(i) capable of regio-selectively deacylating the acyl group at 5'-O-position in the formula [II] above, and
(ii) having an amino acid sequence encoded by a gene which hybridizes to a nucleotide sequence encoding an amino acid sequence of SEQ ID NO: 1
本发明公开了一种生产式[I]核苷衍生物的工艺:
其特征在于将式[II]的2',3',5'-O-三酰基核苷衍生物
与酯水解酶接触:
(i) 能够对上述式[II]中 5'-O-位上的酰基进行选择性脱酰基,和
(ii) 具有与编码 SEQ ID NO: 1 氨基酸序列的核苷酸序列杂交的基因所编码的 氨基酸序列