作者:Jürgen Schmidt、Bernd Eschgfäller、Steven A. Benner
DOI:10.1002/hlca.200390243
日期:2003.9
homologated at the 3′- and 5′-positions. This route, applicable to both the D- and L-enantiomeric forms, is suitable for the preparation of monomeric bis-homonucleosides needed for the synthesis of oligonucleotide analogs. It begins with the known monobenzyl ether 3 of pent-2-yne-1,5-diol, which is reduced to alkenol 4. Sharpless asymmetric epoxidation of 4, followed by opening of the epoxide 5 with allylmagnesium
提出了一条新的路线来制备在3'和5'位置同源的核苷类似物。该途径适用于D-和L-对映体形式,适用于制备合成寡核苷酸类似物所需的单体双同核苷。从已知的戊-2-炔-1,5-二醇单苄基醚3还原为烯醇4。夏普勒斯的不对称环氧化4,随后环氧化物的开口5与烯丙基溴化镁,给人二醇的混合物6和7。保护伯醇作为甲硅烷基醚,然后用OsO 4和NaIO 4处理,然后在MeOH中加入弱酸,然后还原,得到(2 R,3 R)[((叔丁基)二苯基甲硅烷基]氧基}甲基}四氢-2-(2-羟乙基)-5-甲氧基呋喃(=甲基3 -[((叔丁基)二苯基甲硅烷基]氧基}甲基} -2,3,5-三苯氧基-α / β -D-赤型-六呋喃糖苷;10)(方案1)。借助于三氟甲磺酸三甲基甲硅烷基酯将保护的核碱基添加到该骨架中(方案2)。的Ô甲苯甲酰(2-MEC 6 ħ 4 CO)和p -anisoyl(4- MeOC 6 ħ 4CO)基