Alkoxyl radical fragmentation of 3-azido-2,3-dideoxy-2-halo-hexopyranoses: a new entry to chiral polyhydroxylated 2-azido-1-halo-1-alkenes
作者:Carmen R. Alonso-Cruz、Alan R. Kennedy、María S. Rodríguez、Ernesto Suárez
DOI:10.1016/j.tetlet.2007.07.190
日期:2007.10
A new general two-step methodology for the synthesis of chiral fluoro, chloro, bromo and iodo vinyl azides from carbohydrate-derived halohydrins has been developed. The anomeric alkoxyl radical fragmentation of 3-azido-2,3-dideoxy-2-halo-pyranoses under oxidative conditions with (diacetoxyiodo)benzene and iodine gave 2-azido-1,2-dideoxy-1-halo-1-iodo-alditols, which by chemoselective dehydroiodination
已经开发了一种新的通用两步法,可从碳水化合物衍生的卤代醇合成手性氟,氯,溴和碘乙烯基叠氮化物。在(2-乙酰氧基碘)苯和碘的氧化条件下,3-叠氮基-2,3-二脱氧-2-卤代吡喃糖的异头烷氧基自由基断裂,得到2-叠氮基-1,2-二脱氧-1-卤代-1-碘代-糖醇,其通过化学选择性得到脱碘化氢(ž,ê)-2-叠氮基-1,2-二脱氧-1-卤代-4- ö甲酰基戊-1- enitols在良好的总体产率。这些化合物用于合成迄今未知的二取代的2-卤代-3-烷基-2 H-叠氮基的初步热解和光化学研究也已经完成。