作者:Mária Petrušová、Michal Vojtech、Božena Pribulová、Erika Lattová、Mária Matulová、Monika Poláková、James N. BeMiller、Vladimír Křen、Ladislav Petruš
DOI:10.1016/j.carres.2006.04.050
日期:2006.9
giving both five-membered and six-membered all-sp3-atom rings. Determination of the reaction intermediate enabled extension of the Nef reaction to C-glycosylnitromethanes. Protonated aci-nitro forms of C-glycosylnitromethanes that are resistant to the Nef reaction in aqueous acidic media undergo a modified Nef reaction in acidified methanol, and the corresponding C-glycosylmethanal dimethyl acetals with
3,4,5,6-四-O-乙酰基-1,2-二脱氧-1-阿拉伯糖基-己糖-1-烯醇的酸催化甲醇分解反应通过一系列级联的连续反应进行,导致其区域特异性转化为混合物α-和β-CL-阿拉伯呋喃糖基甲缩醛二甲基乙缩醛和混合的内部甲基乙缩醛。整个过程最终产品的结构提供了独特的证据,即在可同时提供五元和六元全sp3-原子的可逆系统中,动力学控制的五元环闭环先于六元环闭环戒指。反应中间体的确定使得Nef反应可以扩展为C-糖基硝基甲烷。在水性酸性介质中能抵抗Nef反应的质子化的C-糖基硝基甲烷的乙酰硝基形式在酸性甲醇中进行修饰的Nef反应,