Facile Synthesis of 2?-Deoxyribofuranosides of Allopurinol and 4-Amino-1H-pyrazolo[3,4-d]pyrimidinevia Phase-Transfer Glycosylation
作者:Frank Seela、Herbert Steker
DOI:10.1002/hlca.19850680305
日期:1985.5.15
Phase-transfer glycosylation of 4-methoxy-1H-pyrazolo[3,4-d]pyrimidine with the 2-deoxyribofuranosyl chloride 9 formed the N(1)-β-nucleoside 10a as main product (39%). As by-products the α-D-anomer 11a (7%) and the N(2)-isomer 12a (18%) were isolated. Assignment of these isomers was made on the basis of their 1H- and 13C-NMR spectra. Removal of the sugar-protecting groups yielded the 4-methoxy-nucleosides
4-甲氧基-1 H-吡唑并[3,4- d ]嘧啶与2-脱氧呋喃呋喃糖基氯9的相转移糖基化反应形成N(1)-β-核苷10a为主要产物(39%)。作为副产物,分离出α-D-异构体11a(7%)和N(2)-异构体12a(18%)。这些异构体的分配基于其1 H-和13 C-NMR光谱进行。除去糖保护基团分别得到4-甲氧基核苷10b,11b和12b。4-MeO-基团的亲核取代产生别嘌呤醇的2-脱氧核糖呋喃糖苷1-4和4-氨基-1H-吡唑并[3,4- d ]嘧啶。