Synthesis of novel 3-[(1-glycosyl-1H-1,2,3-triazol-4-yl)- methylamino]ket-2-en-1-ones
作者:Banty Kumar、Jyotirmoy Maity、Amit Kumar、Vinod Khatri、Bhawani Shankar、Ashok K. Prasad
DOI:10.1007/s10593-018-2274-2
日期:2018.3
by Sonogashira reaction of substituted acetylenes and benzoyl chloride followed by Michael-type addition of propargylamine to the resulting substituted alkynes in good yields. The precursor azido sugars, 1-azido-2,3,5-tri-O-benzoyl-β-D-ribofuranose and 2,3,4,6-tetra-O-acetyl-1-azido-β-D-glucopyranose, were synthesized by azidation of 1-O-acetyl-2,3,5-tri-O-benzoyl-β-D-ribofuranose and β-D-glucopyranose
九个3-[(1-β-D-呋喃核糖基)和3-[(1-β-D-吡喃葡萄糖基-1 H -1,2,3-三唑-4-基)甲基氨基] ket-2-en-1炔丙基胺衍生物与1-叠氮基-2,3,5-三-O-苯甲酰基β-D-呋喃核糖或2,3,4,6-四氢呋喃之间的铜催化叠氮化物-炔烃环加成反应(CuAAC)合成- ø -乙酰基-1-叠氮基β-d-D-吡喃葡萄糖,接着将得到的三-脱保护ö -benzoyl-或四ö-乙酰基-1-β-D-糖基三唑的收率良好。通过取代乙炔和苯甲酰氯的Sonogashira反应,然后以良好的产率将炔丙胺迈克尔型加到所得取代炔烃中来合成前体炔丙胺衍生物。前体叠氮基糖,1-叠氮基-2,3,5-三-O-苯甲酰基-β-D-呋喃呋喃糖和2,3,4,6-四-O-乙酰基-1-叠氮基-β-D-吡喃葡萄糖在氯化锡(IV)存在下,分别用叠氮三甲基硅烷将1 - O-乙酰基-2,3,5-三-O-苯甲酰基-β-
Facile synthesis of heavily-substituted alkynylpyridines via a Sonogashira approach
作者:Yilmaz Kelgokmen、Metin Zora
DOI:10.1039/c5ra21701f
日期:——
A robust synthesis of highly-substituted alkynylpyridines via a Sonogashira approach is described, providing a library of functionalized pyridines for biological studies.
A transition-metal-free synthesis of pyridine derivatives by 6-endo-dig cyclization of N-propargyl enamines was developed. This method is environmentally friendly and is a high atom economy reaction that is easily accessed to provide pyridine derivatives in moderate to good yield by heating N-propargyl enamines in solvent without additives. The total synthesis of onychine was achieved in 51% yield