cyclise stereospecifically in ethanolic hydrochloric acid to 5-(2,3,5-tri-O-benzyl-β-D-ribofuranosyl)uracil and its α-anomer. Debenzylation by boron trichloride gives 5-β-D-ribofuranosyluracil, pseudouridine, and its α-anomer. 2,3,5-Tri-O-methylribose reacts analogously. 2,3-O-Isopropylideneribose and its 5-O-trityl derivative give no polyol, but instead 2,4-di-t-butoxy-5-(2-hydroxyisopropyl)pyrimidine
2,3,5-三-O-苄基
核糖和2,4-二叔丁氧基-5-
硫代
嘧啶(来自5-
溴化合物和丁基
锂)在–78°C的THF中给出5-(2,3 ,5-三- ö苄基d -雅卓-pentahydroxypentyl)-2,4-二叔butoxypyrimidine及其d -同种异体差向异构体(比例5:2),其立体特异性环化在
乙醇盐酸5-( 2,3,5-三-O-苄基-β - D-
呋喃呋喃糖基)尿
嘧啶及其α-端基异构体。用
三氯化硼进行脱苄基反应得到5-β- D-
呋喃呋喃糖基尿
嘧啶,
假尿苷及其α-端基异构体。2,3,5-Tri- O-甲基核
糖类似地反应。2,3- O-异亚丙基异戊糖及其5-O-三苯甲基衍
生物不产生多元醇,而是2,4-二叔丁氧基-5-(2-羟基异丙基)
嘧啶。