Polymer-supported electrophilic reagents are prepared which efficiently add to carbohydrate-derived glycals under very mild conditions. Depending on the hypervalent reagent initially employed for oxidizing polymer-bound halides 1a or 1b both acetoxyhalogenations or azidoiodination can be carried out. With sugar-derived glycals, 2-deoxy-2-halo-pyranosyl acetates or azides are generated in excellent
制备了聚合物支撑的亲电子试剂,其在非常温和的条件下可有效地添加至
碳水化合物衍生的糖基中。取决于最初用于氧化与聚合物结合的卤化物1a或1b的高价试剂,可以进行乙酰氧基卤化或
叠氮碘化。用糖衍生的
缩醛,可以极好的收率产生2-脱氧-2-卤代
吡喃糖基
乙酸酯或
叠氮化物。游离羟基是可容忍的。甚至完全未保护的
葡糖醛23也可用于2-脱氧-2-
碘代
乙酸糖基
乙酸酯24a,b的短合成。