Dynamic kinetic asymmetric transformations of β-stereogenic α-ketoesters by direct aldolization.

Dynamic kinetic asymmetric transformations of β-stereogenic α-ketoesters by direct aldolization.
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DOI:
10.1002/anie.201306873
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发表时间:
2014-01-03
影响因子:
16.6
通讯作者:
Johnson, Jeffrey S.
Johnson, Jeffrey S.
中科院分区:
化学1区
文献类型:
--
作者:
Corbett, Michael T.;Johnson, Jeffrey S.

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通过硝基甲烷和丙酮的直接缩合反应,外消旋β-溴-α-酮酯的动态动力学不对称转化(DyKAT)提供了获得带有α-立体中心的完全取代的β-乙醇酸衍生物的途径。在温和的反应条件下,以较高的相对和绝对立体控制率,以极高的产率获得了羟醛加合物。机理研究确定,在DyKAT类型I型歧管下,反应通过简单的催化剂介导的β-Bromo-α-keto酯的外消旋进行。
Dynamic kinetic asymmetric transformations (DyKAT) of racemic β-bromo-α-keto esters via direct aldolization of nitromethane and acetone provide access to fully substituted α-glycolic acid derivatives bearing a β-stereocenter. The aldol adducts are obtained in excellent yield with high relative and absolute stereocontrol under mild reaction conditions. Mechanistic studies determined that the reactions proceed through a facile catalyst-mediated racemization of the β-bromo-α-keto esters under a DyKAT Type I manifold.
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