Palladium-Mediated Coupling Reactions of an Aminosubstituted Heterocycle. Direct Synthesis of C-Nucleosides Related to Adenosine
摘要:
C-Nucleosides of the pyrazolo[1,5-a]-1,3,5-triazine aglycon system have been prepared by palladium-mediated coupling of 8-iodopyrazolo[1,5-a]-1,3,5-triazines. 4-(N,N'-Diisobutyloxycarbonyl) amino-8-iodopyrazolo [1,5-a]-1,3,5-triazine and the furanoid glycal 1,4-anhydro-2-deoxy-3-O-[(1,1-dimethylethyl)diphenylsilyl]-D-erythro-pent-1-enitol coupled in the presence of catalytic palladium(0) to yield, after desilylation of the intermediate silyl enol ether, a C-glycoside analog of adenosine.
Palladium-Mediated Coupling Reactions of an Aminosubstituted Heterocycle. Direct Synthesis of C-Nucleosides Related to Adenosine
摘要:
C-Nucleosides of the pyrazolo[1,5-a]-1,3,5-triazine aglycon system have been prepared by palladium-mediated coupling of 8-iodopyrazolo[1,5-a]-1,3,5-triazines. 4-(N,N'-Diisobutyloxycarbonyl) amino-8-iodopyrazolo [1,5-a]-1,3,5-triazine and the furanoid glycal 1,4-anhydro-2-deoxy-3-O-[(1,1-dimethylethyl)diphenylsilyl]-D-erythro-pent-1-enitol coupled in the presence of catalytic palladium(0) to yield, after desilylation of the intermediate silyl enol ether, a C-glycoside analog of adenosine.
Preparation of 1-(tri-n-butylstannyl) furanoid glycals and their use in palladium-mediated coupling reactions
作者:Han-Cheng Zhang、Mohamed Brakta、G.Doyle Daves
DOI:10.1016/0040-4039(93)85009-l
日期:1993.3
1-(Tri-n-butylstannyl)furanoidglycals have been prepared for the first time by lithiation of the corresponding 3-O-unsubstituted glycals followed by reaction with tri-n-butylstannyl chloride. Furanoidglycals bearing an alkoxy (silyloxy) group at C-3 undergo elimination and furan formation. A 3-O-benzyl-1-(tri-n-butylstannyl)furanoidglycal was prepared from the 1-phenylsulfonyl furanoidglycal using tri-n