reaction of α-pyranosides-2-uloses 13, 14, 19 and 24 with DAST and shown that the 1,2-difluorinated compounds 17, 18 and 25 are produced by a ring-contraction reaction. The reaction of 18 with benzyl alcohol gives the tri-benzyl derivative 26 or compound 27, depending on the reaction conditions. Treating 17 with 2-naphthol produced the spiranic compounds 29–31. The reaction of 17 with bis(trimethylsilyl)uracil
我们已经再次研究α-
吡喃糖苷-2- uloses的反应13,14,19和24用
DAST和表明1,2-二
氟化化合物17,18和25是由一个环收缩反应来制备。的反应18与
苄醇给出了三苄基衍
生物26或化合物27,这取决于反应条件。用
2-萘酚处理17生成螺烷化合物29 – 31。的反应17与双(三甲基
硅烷基)尿
嘧啶中产生的mononucleoside28,其在更多取代的碳中保留
氟原子。