作者:Daniel M. Brown、Richard C. Ogden
DOI:10.1039/p19810000723
日期:——
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。