Synthesis of 4-Amino-5-<i>H</i>-2,3-dihydroisothiazole-1,1-dioxide Ring Systems on Sugar Templates via Carbanion-Mediated Sulfonamide Intramolecular Cyclization Reactions (CSIC Protocols) of Glyco-α-sulfonamidonitriles
作者:Laura Domínguez、Albert Nguyen Van Nhien、Cyrille Tomassi、Christophe Len、Denis Postel、José Marco-Contelles
DOI:10.1021/jo035301g
日期:2004.2.1
glyco-α-sulfonamidonitriles derived from readily available monosaccharides have been extensively investigated using potassium carbonate, cesium carbonate, n-BuLi, and LDA as bases. As a result, a series of enantiomerically pure spiro(4-amino-5-H-2,3-dihydroisothiazole-1,1-dioxide) derivatives have been prepared efficiently and isolated in good yield. The synthesis of these new bicyclic systems is key to accessing a novel
使用碳酸钾,碳酸铯,n- BuLi和LDA作为碱已广泛研究了衍生自易得单糖的糖-α-磺酰胺基腈的碳负离子介导的磺酸盐分子内环化反应(CSIC方案)。结果,已经有效地制备了一系列对映体纯的螺(4-氨基-5- H -2,3-二氢异噻唑-1,1-二氧化物)衍生物,并以高收率分离。这些新的双环系统的合成是访问TSAO核苷(ATSAOs)的一系列氮杂类似物的关键。