Anticancer and Antiviral Effects and Inactivation of <i>S</i>-Adenosyl-<scp>l</scp>-homocysteine Hydrolase with 5‘-Carboxaldehydes and Oximes Synthesized from Adenosine and Sugar-Modified Analogues
作者:Stanislaw F. Wnuk、Chong-Sheng Yuan、Ronald T. Borchardt、Jan Balzarini、Erik De Clercq、Morris J. Robins
DOI:10.1021/jm960828p
日期:1997.5.1
5'-carboxaldehyde analogues by Moffatt oxidation (dimethyl sulfoxide/dicyclohexylcarbodiimide/dichloroacetic acid) or with the Dess-Martin periodinane reagent. Hydrolysis of a 5'-fluoro-5'-S-methyl-5'-thio (alpha-fluoro thioether) arabinosyl derivative also gave the 5'-carboxaldehyde. Treatment of 5'-carboxaldehydes with hydroxylamine [or O-(methyl, ethyl, and benzyl)hydroxylamine] hydrochloride gave
通过Moffatt氧化(二甲基亚砜/二环己基碳二亚胺/二氯乙酸)或用Dess-Martin高碘烷试剂将选择性保护的腺嘌呤核苷转化为5'-甲醛醛类似物。5'-氟-5'-S-甲基-5'-硫代(α-氟硫醚)阿拉伯糖基衍生物的水解也得到5'-甲醛。用羟胺[或O-(甲基,乙基和苄基)羟胺]盐酸盐处理5'-甲醛,得到E / Z肟。用三氟乙酸水溶液和丙酮处理纯化的肟可实现反式肟化反应,从而提供干净的5'-甲醛样品。腺苷(Ado)-5'-甲醛及其4'-末端是S-腺苷-L-高半胱氨酸(AdoHcy)水解酶的有效抑制剂。它们与酶有效结合并在C3'处发生氧化 得到3'-酮类似物,同时降低NAD +辅因子,得到无活性的,紧密结合的NADH-酶复合物(I型辅因子耗竭抑制)。用含有核糖顺式2',3'-乙二醇的5'-羧醛观察到了有效的I型抑制作用。它们的肟衍生物是“前抑制剂”,它们经过酶催化水解后在活性位点释放抑制剂。