Synthesis of 5′-azido- and 5′-amino-2′,5′-dideoxynucleosides from quinazoline-2,4(1<i>H</i>,3<i>H</i>)-diones
作者:Ahmed A. El-Barbary、Nasser R. El-Brollosy、Erik B. Pedersen、Claus Nielsen
DOI:10.1002/jhet.5570320302
日期:1995.5
Quinazoline-2,4(1H,3H)-diones 4 were silylated and condensed with methyl 5-azido-2,5-dideoxy-3-O-(4-methylbenzoyl)-α,β-D-erythro-pentofuranoside (3) using trimethylsilyl trifluoromethanesulfonate (TMS triflate) as the catalyst to afford the corresponding 5′-azidonucleosides 5. 1-(5-Azido-2,5-dideoxy-α-D-erythro-pentofuranosyl)quinazoline-2,4(1H,3H)-diones 6 and the corresponding β anomers were obtained
喹唑啉-2,4(1 H,3 H)-二酮4被甲硅烷基化并与甲基5-叠氮基2,5,5-二脱氧-3 - O-(4-甲基苯甲酰基)-α,β-D-赤型-戊呋喃糖苷缩合(3)使用三氟甲磺酸三甲基甲硅烷基酯(TMS三氟甲磺酸酯)作为催化剂,得到相应的5'-叠氮核苷5。1-(5-叠氮基-2,5-二脱氧-α-D-赤型-五氟呋喃糖基)喹唑啉-2,4(1 H,3 H)-二酮6和相应的β端基异构体通过在甲醇中用甲醇钠处理5得到在室温下为甲醇。6-甲基-1-(5-氨基-2,5-二脱氧-β-D-赤型通过用吡啶中的三苯基膦处理相应的叠氮基衍生物7,然后用氢氧化铵水解,得到-五呋喃糖基)喹唑啉-2,4(1 H,3 H)-二酮(8)。