A Catalytic Enantioselective Route to Hydroxy-Substituted Quaternary Carbon Centers: Resolution of Tertiary Aldols with a Catalytic Antibody
作者:Benjamin List、Doron Shabat、Guofu Zhong、James M. Turner、Anthony Li、Tommy Bui、James Anderson、Richard A. Lerner、Carlos F. Barbas
DOI:10.1021/ja991507g
日期:1999.8.1
antibody catalyzed retro-aldol reactions. The catalytic proficiency, (kcat/KM)/kuncat, of the antibody for these reactions was on the order of 1010 M-1. A fluorogenic tertiary aldol allowed for the quantitative study of enantiomeric excess as a function of reaction conversion, revealing an E value of ca. 160 in this case. Study of a variety of substrates demonstrated that antibody-catalyzed retro-aldolization
研究了醛缩酶抗体 38C2 催化的三级醛缩分解。三级羟醛被证明是用于抗体催化的逆羟醛反应的非常好的底物。抗体对这些反应的催化效率 (kcat/KM)/kuncat 约为 1010 M-1。荧光叔醛醇允许对映体过量作为反应转化的函数进行定量研究,揭示了约的 E 值。在这种情况下为 160。对各种底物的研究表明,抗体催化的逆醛醇化可快速进入高度对映异构体富集的叔醛醇,通常>95% ee,含有结构不同的杂原子取代的季碳中心。这种方法对天然产物合成的效用已通过 (+)-frontalin 的合成得到证明,