Enantioselective Synthesis of a Sterically Hindered Amine
    5.
    发明申请
    Enantioselective Synthesis of a Sterically Hindered Amine 审中-公开
    对映选择性合成受阻胺

    公开(公告)号:US20080207950A1

    公开(公告)日:2008-08-28

    申请号:US11792744

    申请日:2005-12-12

    摘要: Compounds of the formula (I) wherein R is phenyl, or phenyl substituted by Cl, Br, C1-C4alkyl or CF3; R1 is H or methyl or ethyl; R2 is H or methyl or acyl; R3 is H or methyl; R′4 is —CH3 or ═CH2; may be obtained in high enantiopurity by hydrogenation of a compound of the formula (II) wherein R and R3 are as in formula (I); A is acyl; and R4 is —CH3 or ═CH2; in the presence of a chiral Rhodium or Ruthenium catalyst. Residues R1 as methyl or ethyl and/or R2 as H or methyl may subsequently be introduced without racemization by deacylation and optional alkylation.

    摘要翻译: 其中R是苯基的式(I)化合物或被Cl,Br,C 1 -C 4烷基或CF 3取代的苯基, ; R 1是H或甲基或乙基; R 2是H或甲基或酰基; R 3是H或甲基; R'4是-CH 3或-CH 2; 可以通过氢化其中R和R 3如式(I)中的式(II)化合物的高对映体纯度获得; A是酰基; 且R 4为-CH 3或-CH 2 2; 在手性铑或钌催化剂存在下。 可以随后引入作为甲基或乙基的残基R 1,和/或作为H或甲基的R 2 2,通过脱酰基和任选的烷基化引入外消旋。