作者:M. Vojtech、M. Petrušová、B. Pribulová、L. Petruš
DOI:10.1016/j.tetlet.2008.03.044
日期:2008.5
Treatment of the sodium nitronate forms of 1-deoxy-1-nitrohexitols with methanolic sulfuric or hydrochloric acid at −30 °C leads to their regiospecific conversion to the corresponding methyl glycofuranosides. The reaction exhibits more pronounced stereoselectivity for 1-deoxy-1-nitroalditols with the 2,3-erythro configuration than with the 2,3-threo substrates and cis methyl glycofuranosides are the
在-30°C下用甲醇硫酸或盐酸处理1-脱氧-1-硝基己糖醇的亚硝酸钠形式,导致其区域特异性转化为相应的甲基呋喃糖苷。该反应对具有2,3-赤型构型的1-脱氧-1-硝基醛醇的立体选择性高于与2,3-苏式底物的立体选择性,而顺式甲基葡糖呋喃糖苷是主要产物。观察到的立体选择性表明质子化的α-硝基形式的裂解是一个两步过程,包括亲核加成到质子化的碳-氮双键上,然后用双分子亲核取代含氮残基。