Stereocontrolled conversion of some optically active (4S,5R)-dihydroisoxazoles into acyclic 3-acetamido-1,2-diols
作者:Jamie F Bickley、Stanley M Roberts、Ye Runhui、John Skidmore、Corina B Smith
DOI:10.1016/s0040-4020(03)00868-8
日期:2003.7
Optically active (4S,5R)-dihydroisoxazoles 5a–c (90–91% ee) have been prepared by reaction of the epoxyketones 4a–c with hydroxylamine. Reduction of compounds 5a and 5b using lithium aluminium hydride took place exclusively from the Re face to give (1R,2S,3S)-1,3-disubstituted-3-aminopropane-1,2-diols 6a and 6b. These amino-diols were characterised by N-acetylation and the stereochemical sense of the
光学活性的(4 S,5 R)-二氢异恶唑5a – c(90–91%ee)是通过环氧酮4a – c与羟胺反应制备的。仅从Re面使用氢化锂铝还原化合物5a和5b,得到(1 R,2 S,3 S)-1,3-二取代-3-氨基丙烷-1,2-二醇6a和6b。这些氨基二醇的特征是N通过将酰胺7a和7b转化为α-氨基酸衍生物10a和10b证实了-乙酰化和氢化物还原的立体化学意义。