Nucleoside H-Phosphonates. 18. Synthesis of Unprotected Nucleoside 5‘-H-Phosphonates and Nucleoside 5‘-H-Phosphonothioates and Their Conversion into the 5‘-Phosphorothioate and 5‘-Phosphorodithioate Monoesters
摘要:
A simple and efficient protocol for the preparation of unprotected nucleoside 5'-H-phosphonates and nucleoside 5'-H-phosphonothioates via a one-step deprotection of suitable precursors with methylamine has been developed. The synthetic utility of the unprotected nucleotide derivatives was demonstrated by converting them under mild conditions to the corresponding nucleoside 5'-phosphorothioate and nucleoside 5'-phosphorodithioate monoesters. Factors affecting oxidation of H-phosphonate, H-phosphonothioate, and phosphite derivatives with elemental sulfur are also discussed.
WATER-SOLUBLE CAMPTOTHECIN DERIVATIVE, PHARMACEUTICAL COMPOSITION AND USE THEREOF
申请人:Zhou Wenqiang
公开号:US20140155336A1
公开(公告)日:2014-06-05
The present invention relates to a water soluble derivative of camptothecin and preparation method thereof, the derivative having a structure of formula I and being appropriate in water solubility, and having anti-cancer activity and stability of lactonic ring. The present invention also relates to a method for synthesizing the compound and medical use of the compound.
New aromatic and aliphatic 3'-O-acyl-5-fluoro-2'-deoxyuridine derivatives were synthesized and evaluated as candidates for prodrugs against various cancer cell lines. As the most promising candidate for antimalignant therapeutics was found a dual-acting acyl derivative 7h, which apparently released not only the known anticancer nucleoside, 5-fluoro-2'-deoxyuridine (FdU), but also an additional active
Regioselective acylation of nucleosides and their analogs catalyzed by Pseudomonas cepacia lipase: enzyme substrate recognition
作者:Ning Li、Min-Hua Zong、Ding Ma
DOI:10.1016/j.tet.2008.11.045
日期:2009.1
The substraterecognition of Pseudomonas cepacia lipase in the acylation of nucleosides was investigated by means of rational substrate engineering for the first time. P. cepacia lipase displayed excellent 3′-regioselectivities (96 to >99%) in the lauroylation of 2′-deoxynucleosides 1a–1e, while low to good 3′-regioselectivities (59–89%) in the lauroylation of ribonucleosides 1f–1j. It might be due