The naturally occurring Pyrazofurin possesses a broad spectrum of marked antitumor and antiviral activities. The aryl pyrazole C-nucleoside analogs of Pyrazofurin have been synthesized in good to excellent yields by one-pot coupling of sugar alkynes, acid chlorides and hydrazine hydrate at rt. The method is general, mild, and efficient and sixty-two examples have been given. The sugar alkynes include
General and efficient one-pot synthesis of novel sugar/heterocyclic(aryl) 1,2-diketones from sugar terminal alkynes by Sonogashira/tetra-n- butylammonium permanganate oxidation
for one-pot synthesis of novel sugar/heterocyclic(aryl) 1,2-diketones has been achieved by the reaction of various sugar terminal alkynes with heterocyclic(aryl) iodides at room temperature. This one-pot protocol includes Sonogashira coupling and mild n-Bu4NMnO4 oxidation reaction. This method is mild, general and efficient. Fifty-six examples have been given and the sugar/heterocyclic(aryl) 1,2-diketones
Synthesis of het(aryl) imidazole C-nucleoside analogues by CoFe2O4 NPs catalyzed muti-component coupling reaction
作者:Fuyi Zhang、Yang Li、Fei Gao、Hong liu、Yufen Zhao
DOI:10.1016/j.carres.2019.03.013
日期:2019.5
A generalsynthesis of hetaryl and aryl C-4(5) linked imidazoleC-nucleoside analogues has been developed by the reaction of sugar alkynes with het(aryl) iodides, KMnO4/TBAB oxidation and CoFe2O4 NPs catalyzed muti-component coupling of the corresponding diketones, NH4OAc and aromatic aldehydes in one-pot. The sugar alkynes include pyranosides and furanosides with acid sensitive protecting groups.
The synthesis of novel indolizine C-nucleoside analogues has been achieved by the three-component coupling reaction of sugar alkynes, pyridines and α-bromo carbonyl compounds in one pot. The corresponding products are obtained in good to excellent yields. 49 examples have been given. The synthetic method is convenient, practical and efficient. It is suitable for various substrates including structurally
Concise synthesis of novel benzoylthiophene C-nucleoside analogues has been achieved by the reaction of various terminal sugar alkynes with substituted benzoyl chlorides and 1,4-dithiane-2,5-diol, and subsequent dilute HCl-promoted dehydration in onepot. The sugar alkynes include pyranosides, furanosides, and acyclic sugar. The benzoyl chloride has various substituents. Twenty-eight examples are given