A Synthetic Route to Fully Substituted Chiral Cyclopentylamine Derivatives: Precursors of Carbanucleosides
作者:Sukhendu Mandal、Ramprasad Ghosh、Joy Maity、Michael Drew、Basudeb Achari
DOI:10.1055/s-0029-1218677
日期:2010.4
substrate 6 afforded 7, which upon acetonide deprotection followed by reaction with N-benzylhydroxylamine furnished two isomeric isoxazolidinocyclopentane derivatives via spontaneous cyclization of an in situ generated nitrone. The methyl xanthate derivative of the tertiary hydroxyl group of one isomer was isolated and subjected to radical deoxygenation reaction to form epimeric products, while with the other
从衍生自d-葡萄糖的底物6上除去甲硅烷基保护,得到7,其在乙炔化物脱保护后与N反应-苄基羟胺通过原位生成的硝酮的自发环化作用提供了两种异构的异恶唑烷环戊烷衍生物。分离出一种异构体的叔羟基的甲基黄药衍生物并进行自由基脱氧反应以形成差向异构体产物,同时与另一种异构体进行自发的1,2-消除反应以形成两种可能的环内烯烃的混合物。纯化产物的异恶唑烷环的氢解裂解,然后插入5-氨基-4-氯嘧啶部分和嘌呤环的构建,顺利地提供了结构上独特的碳核苷类似物。用各种光谱方法对合成的化合物进行分析,并对一种重要中间体进行X射线分析,以确定产物的结构和立体化学。 环戊胺-反应INC - carbanucleosides - d -葡萄糖