Application of Germyldesulfonylation Reactions to the Synthesis of Germanium-Containing Nucleoside Analogues
作者:Stanislaw F. Wnuk、Pablo R. Sacasa、Jorge Restrepo
DOI:10.1080/15257770903054340
日期:2009.8.11
adenosine derivatives with tributyl- or triphenylgermane hydride (AIBN/toluene/Δ) effected radical-mediated germyldesulfonylations to give 5′-(tributyl- or triphenylgermyl)methylene-5′-deoxyuridine and adenosine derivatives as single (E)-isomers. Analogous treatment of 2′-deoxy-2′-[(phenylsulfonyl)methylene]uridine with Ph3GeH afforded the corresponding vinyl triphenylgermane product. Stereoselective halodegermylation
Nucleic acid related compounds. 78. Stereocontrolled syntheses of 6′(<i>E</i> and <i>Z</i>)-halovinyl analogues from uridine-derived vinylsulfones via vinyltin intermediates
作者:Stanislaw F. Wnuk、Morris J. Robins
DOI:10.1139/v93-028
日期:1993.2.1
Treatment of the 6′(E)-tosylvinyl homonucleoside 1a with Bu3SnH/AIBN/toluene/Δ gave separable mixtures of 6′-vinylstannanes 2a(E/Z) in high yields. Stereospecific halodestannylations with N-iodosuccinimide, bromine, and N-bromosuccinimide proceeded smoothly to give the 6′(E or Z)-iodo(and bromo) vinyl compounds with retention of configuration. Chlorine or iodobenzene dichloride effected moderately