Diastereoselective addition of planar N-heterocycles to vinyl sulfone-modified carbohydrates: a new route to isonucleosides
作者:Aditya K. Sanki、Rahul Bhattacharya、Ananta Kumar Atta、Cheravakkattu G. Suresh、Tanmaya Pathak
DOI:10.1016/j.tet.2008.08.050
日期:2008.11
C-2 positions of vinyl sulfone-modified carbohydrates provide an efficient and general route for the carbon–N-heterocycle bond formation. Therefore, the addition pattern of planar heterocycles, such as imidazole, triazole, thymine, and adenine to 3-C-phenylsulfonyl-hex-2-enopyranosides (1α/1β) and 3-C-p-toluenesulfonyl-pent-2-enofuranosides (2α/2β) was studied for developing a general methodology for
在乙烯基砜改性的碳水化合物的C-2位上的平面N杂环的Michael型加成反应为碳N杂环键的形成提供了一条有效而通用的途径。因此,平面杂环,如咪唑,三唑,胸腺嘧啶和腺嘌呤到3-的加入图案Ç -苯磺酰基-己-2- enopyranosides(1α / 1β)和3- Ç - p甲苯磺酰-戊-2- enofuranosides (2α / 2β)进行了研究开发的一般方法为新类的异核苷掺入具有碳-合成ñ-呋喃糖基和吡喃糖基糖的C-2位的杂环键。在很大程度上,起始乙烯基砜的异头构型在决定添加杂环的非对映选择性中起着至关重要的作用。然而,三苯甲基保护的3 - C-对甲苯磺酰基-己-2-烯吡喃糖苷(33α / 33β)被认为是用于合成新种类的胸腺嘧啶和腺嘌呤脱氧异核苷的脱磺酰基和脱保护基的更实用的原料。