The synthesis of d-ribofuranosyl derivatives of methyl propiolate and a study of the activating influence of the ester group in cylcoaddition reactions
作者:J.Grant Buchanan、Allan R. Edgar、Micahel J. Power、Gavin C. Williams
DOI:10.1016/s0008-6215(00)84457-2
日期:1977.5
2,3,5-Tri-O-benzyl-D-ribofuranosyl bromide (17) has been converted into methyl 3-(2,3,5-tri-O-benzyl-beta-D-ribofuranosyl) propiolate (8) and its alpha anomer 10 in 21 and 42% yields, respectively, by reaction with the silver salt of methyl propiolate. Attempts to prepare 8 from (beta-D-ribofuranosyl)ethyne (1) by standard methods were unsuccessful. The reactions of the esters 8 and 10 and the ethyne
2,3,5-三-O-苄基-D-呋喃呋喃糖基溴化物(17)已转化为3-(2,3,5-三-O-苄基-β-D-呋喃呋喃糖基)丙酸甲酯(8)和通过与丙酸甲酯的银盐反应,其α端基异构体10的产率分别为21%和42%。尝试通过标准方法从(β-D-呋喃呋喃糖基)乙炔(1)制备8的尝试失败。已经研究了酯8和10与乙炔1与几个1,3-偶极的反应。8和10与重氮甲烷分别得到吡唑酯20和28,其中乙炔1反应较慢,得到23(37%)和26(31%)的混合物。通过与叠氮化苄反应,将酯10转化为三唑32(51%)和36(34%)。用苯肼处理酯10,以71%的产率得到吡唑啉酮38。