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,