作者:Constantin Mamat、Martin Hein、Ralf Miethchen
DOI:10.1016/j.carres.2006.01.011
日期:2006.7
A convenient two-step strategy is reported for the synthesis of fluorinated optically pure acyclo-C-nucleoside analogues starting from simple glycals. In the first step, benzyl- or p-methoxybenzyl-protected glycals are treated with trifluoroacetic anhydride, bromodifluoroacetyl chloride, trichloroacetyl chloride, and perfluorooctanoyl chloride, respectively, in the presence of Et3N. This one-pot procedure
据报道,从简单的糖类开始,合成氟化的光学纯的无环C-核苷类似物的方便的两步策略。第一步,在Et3N存在下,分别用三氟乙酸酐,溴二氟乙酰氯,三氯乙酰氯和全氟辛酰氯处理苄基或对甲氧基苄基保护的糖。这种一锅法可制得1,2-不饱和糖(1,5-脱水-3,4,6-三-O-苄基(或对甲氧基苄基)2-脱氧-2-全卤代酰基-D-阿拉伯糖基/ lyxo-己基-1-烯醇4-9)在C-2处被酰化。在第二步骤中,通过用双亲核试剂(肼,苯肼,邻苯二胺,羟胺)处理C-酰化的糖基来诱导选择性的环转化。特别是1,5-无水-3,4