Assembling Heterocycle-Tethered <i>C</i>-Glycosyl and α-Amino Acid Residues via 1,3-Dipolar Cycloaddition Reactions
作者:Alessandro Dondoni、Pier Paolo Giovannini、Alessandro Massi
DOI:10.1021/ol048963g
日期:2004.8.1
The 1,3-dipolar cycloadditions of C-glycosyl nitrile oxides and acetylenes to an alkyne and an azide, respectively, bearing a masked glycinyl moiety furnished disubstituted isoxazoles and triazoles. Unveiling the glycinyl group in these cycloadducts afforded C-glycosyl alpha-amino acids in which the two bioactive entities were tethered through rigid five-membered heterocycles. Optimized entries to
C-糖基腈氧化物和乙炔的1,3-偶极环加成分别成炔基和叠氮化物,它们带有掩蔽的缩水甘油基部分,提供了二取代的异恶唑和三唑。在这些环加合物中揭示甘氨酸基团得到C-糖基α-氨基酸,其中两个生物活性实体通过刚性五元杂环束缚。相同化合物的最佳化合物包括使用未掩盖但受保护的含炔烃和叠氮化物的氨基酸作为1,3-偶极环加成反应的伙伴。