Regio- and stereoselective reduction of bicyclic imides for the asymmetric synthesis of highly substituted pyrrolidines
作者:Pierre Deprez、Jacques Royer、Henri-Philippe Husson
DOI:10.1016/s0040-4020(01)90230-3
日期:1993.4
cycloaddition of N-phenylmaleimide with azomethine ylides generated from α-aminonitrile or α-aminoester oxazolidines gave bicyclic imides, which were reduced regio- and stereoselectively to hydroxylactams. In the aminonitrile series, reduction with NaBH4/CeCl3 at low temperature gave a single hydroxylactam in high yield. In the aminoester series the regioselectivity was more dependent on the structure, and
N-苯基马来酰亚胺的1,3-偶极环加成反应与由α-氨基腈或α-氨基酯恶唑烷生成的甲亚胺基团产生双环酰亚胺,其区域和立体选择性还原为羟基内酰胺。在氨基腈系列中,在低温下用NaBH 4 / CeCl 3还原可得到高产率的单一羟基内酰胺。在氨基酯系列中,区域选择性更多地取决于结构,并且发现其他条件(LiBEt 3 H)获得的单个羟基内酰胺与氨基腈系列相比对应于反向区域化学。