Stereoselective Synthesis of the β-Anomer of 4‘-Thionucleosides Based on Electrophilic Glycosidation to 4-Thiofuranoid Glycals
作者:Kazuhiro Haraguchi、Haruhiko Takahashi、Noriaki Shiina、Chikafumi Horii、Yuichi Yoshimura、Ayako Nishikawa、Eiko Sasakura、Kazuo T. Nakamura、Hiromichi Tanaka
DOI:10.1021/jo020037x
日期:2002.8.1
suitable for the preparation of 3,5-O-(tetraisopropyldisiloxane-1,3-diyl) (9) and 3,5-O-(di-tert-butylsilylene) (11) 4-thioglycals. The glycosidation reactions of these 4-thioglycals were carried out, in the presence of either PhSeCl or NIS, by using silylated derivatives of uracil, thymine, cytosine, and N(6)-benzoyladenine. Among the three 4-thioglycals, 11 was found to be an excellent glycosyl donor, forming
制备了具有不同3,5-O-甲硅烷基保护基的三种类型的4-硫呋喃基糖,并对其亲电性进行了研究。3,5-双-O-(叔丁基二甲基甲硅烷基)-4-硫呋喃类化合物糖基(5)是通过将2-脱氧-4-硫代-D-赤型戊呋喃糖(4)进行甲磺酸化并随后进行碱促进的消除反应而获得的,热消除亚砜衍生物适用于制备3,5-O-(四异丙基二硅氧烷-1,3-二基)(9)和3,5-O-(二叔丁基亚甲硅烷基)(11)4-硫代缩醛。通过使用尿嘧啶,胸腺嘧啶,胞嘧啶和N(6)-苯甲酰腺嘌呤的甲硅烷基化衍生物,在PhSeCl或NIS存在下,进行这些4-硫代糖基的糖基化反应。在这三种4-硫代糖中,有11种是出色的糖基供体,