作者:Andrew R. Beard、Paul I. Butler、John Mann、Neil K. Partlett
DOI:10.1016/0008-6215(90)80130-u
日期:1990.9
Abstract A six-stage synthesis of 2′,3′-dideoxy-2′,3′-α-methanocytidine ( 3 ) from (5 S )-5-benzoyloxymethyl-(5 H )-furan-2-one ( 5 ) is described. The key step involved the stereoselective formation of (1 R ,4 S ,5 S )-4-benzoyloxymethyl-3-oxabicyclo[3.1.0]hexan-2-one ( 7 ) via 1,3-dipolar cycloaddition of diazomethane to 5 followed by photoinduced elimination of nitrogen. Reduction of 7 to the corresponding
摘要由(5 S)-5-苯甲酰氧基甲基-(5 H)-呋喃-2-酮(5)六步合成2',3'-二脱氧-2',3'-α-甲酰胞嘧啶(3)描述。关键步骤涉及通过重氮甲烷的1,3-偶极环加成反应将立体异构选择性地形成(1 R,4 S,5 S)-4-苯甲酰氧基甲基-3-氧杂双环[3.1.0]己二-2-(7)。然后光诱导消除氮。将7还原为相应的内酯,然后进行乙酰化,主要得到1-O-乙酰基-5-O-苯甲酰基-2,3-二脱氧-β-d-核呋喃糖(8)。8与2,4-双(三甲基甲硅烷基)胞嘧啶和EtAlCl 2的反应,然后脱保护并进行色谱分离,得到3,其仅表现出对人免疫缺陷病毒(HIV)的弱活性。