Horton D, Chen K, No Z, Lee HC. Synthesis of 3'-C-substituted thymidine derivatives by free-radical techniques: scope and limitations.
Carbohydr Res 2007;
342:259-67. [PMID:
17173879 DOI:
10.1016/j.carres.2006.11.015]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2006] [Revised: 11/07/2006] [Accepted: 11/11/2006] [Indexed: 11/19/2022]
Abstract
The scope and limitations of radical-mediated 3'-C-substitution of pyrimidine nucleosides was evaluated with 5'-O-(tert-butyldimethylsilyl)thymidine or its tert-butyldiphenylsilyl analogue having thionoester or thionoamide groups at O-3', including (methylthio)thiocarbonyl, (phenoxy)thiocarbonyl, (pentafluorophenoxy)thiocarbonyl, and (1-imidazolyl)thiocarbonyl. Their reaction with acrylonitrile, methyl acrylate, and allyltributyltin under radical-generating conditions affords corresponding 3'-C-alkylated products, together with the product of simple deoxygenation at C-3'. The conditions for optimizing the yield of 3'-C-substituted product are presented.
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