Synthesis of (±)-9-[c-4, t-5-bis(hydroxymethyl)cyclopent-2-en-r-1-yl]-9H-adenine (BCA) derivatives branched at the 4′-position based on intramolecular SH2′ cyclization
Synthesis of 4′-branched BCA analogues (5) was carried out. Stereospecific construction of the cis-disposed 4′-carbon-substituents and 5′-hydroxymethyl group was secured by employing the bicyclo[3.3.0]lactone 16 as a key intermediate, which was prepared by radical-mediated intramolecular SH2′ cyclization of the phenylselenomethyl ester 15. After manipulation of the double bond of 16, bis(Boc)adenine
进行了4'-分支的BCA类似物(5)的合成。以双环[3.3.0]内酯16为关键中间体,通过自由基介导的分子内S H 2'环化反应制备了顺式4'-碳取代基和5'-羟甲基的立体特异性结构。苯基硒代甲基酯15。在操纵双键16之后,基于烯丙醇24的Mitsunobu反应引入了双(Boc)腺嘌呤。27的内酯功能的转变允许制备4'-羟甲基(31),4'-乙烯基(32),4'-氰基(31)34)和4'-乙炔基(35)衍生物。还检查了游离核苷36 – 38的抗HIV和抗HCV活性。
Synthesis of (±)-4'-Ethynyl and 4'-Cyano Carbocyclic Analogues of Stavudine (d4T)
The synthesis of (+/-)-4'-ethynyt (8) and 4'-cyano (9) carbocyclic analogues of the anti-HIV agent stavudine (5, d4T) is reported. The carbocyclic unit (16) was constructed from readily available beta-keto ester 10. The ethynyl or cyano group of 8 and 9 were Prepared, after the introduction of thymine base to 16, by manipulation of the ester function. Evaluation of the anti-HIV activity of 8 and 9 was also carried out.