Reaction of silylated 5-phenylcytosine with 1-O-acetyl-2,3,5-tri-O-benzoyl-D-ribose, catalyzed with tin tetrachloride, and subsequent methanolysis afforded 5-phenylcytidine (2). This compound reacted with thionyl chloride in acetonitrile to give cyclic sulfite 3 which on heating in dimethylformamide was converted into 2,2'-anhydro-1-(β-D-arabinofuranosyl)-5-phenylcytosine (4). Analogous reaction of compound 2 with thionyl chloride at reflux gave 5'-chloro-5'-deoxy-2',3'-cyclic sulfite 5. Its heating in dimethylformamide afforded 5'-chloro-2,2'-anhydro derivative 6, mild alkaline hydrolysis led to 5'-chloro-5'-deoxy-5-phenylcytidine (7). Alkaline hydrolysis of 5-phenyl-2,2'-anhydrocytidine (4) gave 5-phenylcytosine arabinoside 8, whereas the 2,2'-anhydro derivative 6 afforded 1-(5-chloro-5-deoxy-β-D-arabinofuranosyl)-5-phenylcytosine (11). At higher temperature, the final reaction product was 2,5'-anhydro-5-phenylcytidine (12). 5'-Chloro-5'-deoxynucleosides 7 and 11 reacted with tri-n-butyl- stannane to give 5'-deoxyribofuranosyl and 5'-deoxyarabinofuranosyl derivatives 15 and 16. 5-Phenylcytidine (2) was converted into the N4-acetate 17 with acetic anhydride. Further reaction with acetic anhydride and hydrogen bromide in acetic acid afforded a mixture of peracetylated 2'-bromo and 3'-bromo derivatives 18 and 19. Reaction with Zn/Cu couple gave 5'-O-acetyl-5-phenyl-2',3'-didehydro derivative 20 and 2',3',5'-tri-O-acetyl-5-phenylcytidine (21). Compound 20 was deblocked to 1-(2,3-dideoxy-β-D-glycero-pent-2-enofuranosyl)-5-phenylcytosine (22). Catalytic hydrogenation of compound 20 over palladium and subsequent deblocking of the protected 2',3'-dideoxy derivative 23 gave 1-(2,3-dideoxy-β-D-glycero-pentofuranosyl)-5-phenylcytosine (24).
使用锡四氯化物催化,将硅化5-苯基胞嘧啶与1-O-乙酰基-2,3,5-三-O-苯甲酰-D-核糖反应,随后进行甲醇解,得到5-苯基胞苷(2)。该化合物与乙腈中的亚磺酰氯反应,生成环状亚磺酸(3),在二甲基甲酰胺中加热后转化为2,2'-脱水-1-(β-D-阿拉伯呋喃核苷基)-5-苯基胞嘧啶(4)。将化合物2与亚磺酰氯在回流下反应,得到5'-氯-5'-脱氧-2',3'-环状亚磺酸(5)。在二甲基甲酰胺中加热,得到5'-氯-2,2'-脱水衍生物(6),温和的碱性水解导致5'-氯-5'-脱氧-5-苯基胞苷(7)。5-苯基-2,2'-脱水胞苷(4)的碱性水解得到5-苯基胞苷阿拉伯苷(8),而2,2'-脱水衍生物(6)则生成1-(5-氯-5-脱氧-β-D-阿拉伯呋喃核苷基)-5-苯基胞嘧啶(11)。在较高温度下,最终反应产物为2,5'-脱水-5-苯基胞苷(12)。5'-氯-5'-脱氧核苷(7)和(11)与三正丁基锡反应,得到5'-脱氧核糖和5'-脱氧阿拉伯核糖衍生物(15)和(16)。将5-苯基胞苷(2)转化为N4-醋酸酯(17),使用乙酸酐和氢溴酸在乙酸中进一步反应,得到2'-溴和3'-溴的过乙酰化混合物(18)和(19)。与锌/铜偶对反应,得到5'-O-乙酰基-5-苯基-2',3'-双去氢衍生物(20)和2',3',5'-三-O-乙酰基-5-苯基胞嘧啶(21)。化合物(20)去保护后得到1-(2,3-二脱氧-β-D-glycero-pent-2-enofuranosyl)-5-苯基胞嘧啶(22)。化合物(20)在钯催化下进行催化氢化,随后去保护2',3'-二脱氧衍生物(23)得到1-(2,3-二脱氧-β-D-glycero-pentofuranosyl)-5-苯基胞嘧啶(24)。