Diastereoselective additions of organolithium and organomagnesium reagents to the CN bond of a chiral, cyclic nitrone derived from erythrulose
作者:J.Alberto Marco、Miguel Carda、Juan Murga、Raul Portolés、Eva Falomir、Johann Lex
DOI:10.1016/s0040-4039(98)00400-6
日期:1998.5
The reaction of the 3,4-O-isopropylidene-l-(S)-erythrulose with hydroxylamine, followed by treatment of the resulting mixture of (E)- and (Z)-oximes with acetone and an acid catalyst, afforded two crystalline chiral compounds. Through X-ray diffraction analysis, these products were identified as a double acetonide derived from the (E)-oxime and a cyclic nitrone derived from the (Z)-oxime. The additions
3,4-O-异亚丙基-1-(S)-赤藓糖与羟胺反应,然后用丙酮和酸催化剂处理所得的(E)-和(Z)-肟的混合物,得到两种结晶手性化合物。通过X射线衍射分析,将这些产物鉴定为衍生自(E)-肟的双丙酮化物和衍生自(Z)-肟的环状硝酮。发现将有机锂和有机镁试剂加到硝酮的CN键上是非对映选择性的。加成产物是有用的中间体,用于制备对映纯形式的α,α-二取代的α-氨基酸和其他含氮化合物。