SYNTHESIS OF 2',3'-DIDEHYDRO-2',3'-DIDEOXYNUCLEOSIDES UTILIZING COUPLING REACTIONS BETWEEN NUCLEIC BASES AND PHENYLTHIO-SUBSTITUTED 2,3-DIDEOXYRIBOSE

被引:20
作者
KAWAKAMI, H [1 ]
EBATA, T [1 ]
KOSEKI, K [1 ]
MATSUMOTO, K [1 ]
MATSUSHITA, H [1 ]
NAOI, Y [1 ]
ITOH, K [1 ]
机构
[1] YUKI GOSEI KOGYO LTD,TOKYO RES LAB,ITABASHI KU,TOKYO 174,JAPAN
关键词
D O I
10.3987/COM-91-5884
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Stereoselectivities in coupling reactions between silylated pyrimidine bases and 3- or 2-alpha-phenylthio-2,3-dideoxyribose were examined. In the former case, no stereoselectivies were observed when the coupling reactions were performed either with 1-chlorosugar in an S(N)2 mode or in the presence of Lewis acids as catalyst in an S(N)1 mode. Coupling reaction with 2-alpha-phenylthio-2,3-dideoxyribose in the presence of Lewis acids, especially SnCl4, proceeded with good stereoselectivity to give anomeric mixtures of alpha:beta = 1:9. All these nucleosides were converted to 2',3'-didehydro-2',3'-dideoxynucleosides by oxidation to sulfoxides followed by thermal elimination of sulfenic acid.
引用
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页码:2451 / 2470
页数:20
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