Studies of nucleosides and nucleotides. LXVIII. Purine cyclonucleosides. 29. Synthesis and properties of O-cyclonucleosides derived from hyposanthine, mercaptopurine, methylmercaptopurine and purine.
摘要:
合成了次黄嘌呤、6-巯基嘌呤、6-甲基巯基嘌呤和嘌呤的 O 型环核苷。次黄嘌呤和 6-巯基嘌呤的环核苷是通过以下方法合成的:①相应腺嘌呤环核苷的衍生化;②适当的 2'- 或 3'-TPS 衍生物的环化。6- 甲基巯基嘌呤和嘌呤的环核苷是由相应的 6- 巯基嘌呤环核苷通过甲基化和雷尼镍脱硫合成的。测量了这些环核苷的紫外光谱(UV)、核磁共振(NMR)、圆二色光谱(CD)和质谱。在 CD 光谱中发现,嘌呤 8,2'-环核苷的科顿效应比其 8,3'-对应物的科顿效应大,这与其他环核苷的顺序不同。
<i>N</i><i><sup>3</sup></i>,5‘-Cycloxanthosine, the First Natural Occurrence of a Cyclonucleoside
作者:Robert J. Capon、Nicholas S. Trotter
DOI:10.1021/np0502692
日期:2005.11.1
An Eryus sp. of marine sponge from the Great Australian Bight has yielded the first reported natural occurrence of a cyclonucleoside, N-3,5'-cycloxanthosine. The structure of N-3,5'-cycloxanthosine was confirmed by detailed spectroscopic analysis and total synthesis.