作者:Neil Baggett、Peter Stribblehill
DOI:10.1016/s0008-6215(00)84693-5
日期:1981.10
of reagents containing hydride, oxygen, nitrogen, and carbon nucleophiles. Only in reactions with methylmagnesium iodide and with diazomethane was the symmetrical bis-adduct obtained. In all other cases, the reactivity of the two carbonyl groups was different. Hydride addition occurred with opposite stereoselectivity at each carbonyl group. With oxygen and nitrogen nucleophiles, cyclic adducts were
摘要用四氧化钌在乙酸乙酯中氧化1,3:4,6-二-O-亚苄基-d-甘露醇得到相应的二酮水合物,将其脱水成游离的二酮。这些化合物用各种含有氢化物,氧,氮和碳亲核试剂的试剂处理。仅在与甲基碘化镁和与重氮甲烷的反应中,获得对称的双加合物。在所有其他情况下,两个羰基的反应性不同。在每个羰基上以相反的立体选择性进行氢化物加成。使用氧和氮亲核试剂,通过一分子亲核试剂桥接两个羰基而获得环状加合物。通过pmr光谱推论出环融合的构型,顺式,在含有一个五元环和两个六元环的化合物中,顺式结构是优选的。在与其他碳亲核试剂的反应中,至少在与苯基溴化镁反应的情况下,由于消除反应,获得了复杂的混合物。