Highly Stereoselective Aminohydroxylations of<i>exo</i>-2-Cyano-7-oxabicyclo[2.2.1]hept-5-en-2-yl Acetate
作者:Susy Allemann、Pierre Vogel
DOI:10.1055/s-1991-26607
日期:——
Protected forms of exo-5-amino-exo-6-hydroxy-7-oxabicyclo [2.2.1]heptan-2-one and of exo-5-amino-endo-6-hydroxy-7-oxabicyclo [2.2.1]heptan-2-one can be obtained readily and with high stereoselectivity from exo-2-cyano-7-oxabicyclo[2.2.1] hept-5-en-2-yl acetate (±)-(7). The processes involve acid promoted rearrangements of N-carbonyl aziridines 10 [(1 RS, 2SR, 4RS,5RS,6SR)-6-cyano-8-oxa-3-azatricyclo[3.2.1.02,4] oct-6-yl acetate derivatives] derived from (±)-7.
外-2-氰基-7-氧杂双环[2.2.1]庚-2-酮和外-5-氨基-内-6-羟基-7-氧杂双环[2.2.1]庚-2-酮的保护形式可以很容易地从外-2-氰基-7-氧杂双环[2.2.1]庚-5-烯-2-基乙酸酯(±)-(7)中以高立体选择性获得。该过程涉及由 (±)-7 衍生的 N-羰基氮丙啶 10[(1RS,2SR,4RS,5RS,6SR)-6-氰基-8-氧杂-3-氮杂双环[3.2.1.02,4] 辛-6-基乙酸酯衍生物]的酸促进重排。