A Study on the Allylic Substitution of (1R,5R,8R)- and (1R,5R,8S)-8-Hydroxy-2-oxabicyclo[3.3.0]oct-6-en-3-one Derivatives − Preparation of (1S,2R,3R)-9-[2-Hydroxy-3-(2-hydroxyethyl)cyclopent-4-en-1-yl]-9H-adenine
作者:Steen K. Johansen、Inge Lundt
DOI:10.1002/1099-0690(200103)2001:6<1129::aid-ejoc1129>3.0.co;2-t
日期:2001.3
both C-6 and C-8 substituted products, thus limiting the synthetic use of the reaction with these nucleophiles. Additionally, Mitsunobu substitution of (1R,5R,8R)-8-hydroxy-2-oxabicyclo[3.3.0]oct-6-en-3-one (3) with 6-chloropurine, followed by reduction of the lactone moiety and treatment with liquid ammonia, gave the carbocyclic nucleoside (1S,2R,3R)-9-[2-hydroxy-3-(2-hydroxyethyl)cyclopent-4-en-1-yl]-9H-adenine
钯催化的酰化(1 R,5 R,8 R)-和(1 R,5 R,8 S)-8-羟基-2-氧杂双环[3.3.0] oct-6-en-3-的取代已经使用许多C-和N-亲核试剂对它们进行了研究。在所有情况下,发现外切衍生物(8 R)比相应的内切衍生物(8 S)更具活性。)。当使用丙二酸二甲酯钠作为亲核试剂时,发现该反应产生良好的产率和单一产物。然而,当使用反应性较低的C-和N-亲核试剂时,反应给出了C-6和C-8取代产物的不可分离的混合物,因此限制了与这些亲核试剂的合成反应。另外,用6-氯嘌呤将(1 R,5 R,8 R)-8-羟基-2-氧杂双环[3.3.0] oct-6-en-3-one(3)的Mitsunobu取代,然后还原内酯部分并用液氨处理,得到碳环核苷(1 S,2 R,3 R)-9- [2-羟基-3-(2-羟乙基)环戊-4-en-1-基] -9 H-腺嘌呤(19),其可以被视为碳环核苷BCA的类似物。