Pinene-derived iminodiacetic acid (PIDA): a powerful ligand for stereoselective synthesis and iterative cross-coupling of C(sp3) boronate building blocks.

Pinene-derived iminodiacetic acid (PIDA): a powerful ligand for stereoselective synthesis and iterative cross-coupling of C(sp3) boronate building blocks.
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DOI:
10.1021/ja205912y
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发表时间:
2011-09-07
影响因子:
15
通讯作者:
Burke, Martin D.
Burke, Martin D.
中科院分区:
化学1区
文献类型:
--
作者:
Li, Junqi;Burke, Martin D.

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有效地获得立体化学纯形式的手性C(SP3)硼酸盐是实现这种构筑块在复杂分子合成中的巨大潜力的关键。在此,我们报道了一种由萜烯衍生的亚氨基二乙酸(PIDA)配体能够从相应的烯烃高度非对映选择性地合成多种环氧乙烷基C(SP3)硼酸酯。反过来,这些氧杂环丙烷基PIDA硼酸酯可以很容易地转化为前所未有的稳定的α-硼醛,通过硼酸基的新的1,2-迁移继续进行,从而完全保持立体化学纯度。含有两个SP3杂化C中心的B保护卤代硼酸很容易通过这个平台获得,并且这里展示的立体控制迭代C(SP3)与这种新型双功能试剂交叉偶联的能力以高度对映体富集型获得具有重要医学意义的手性小分子靶标,这代表了基于构筑块的合成方法的实质性进展。
Efficient access to chiral C(sp3) boronates in stereochemically pure form is critical for realizing the substantial potential of such building blocks in complex-molecule synthesis. We herein report that a pinene-derived iminodiacetic acid (PIDA) ligand enables the highly diastereoselective synthesis of a wide range of oxiranyl C(sp3) boronates from the corresponding olefins. These oxiranyl PIDA boronates, in turn, can be readily transformed into unprecedented stable α-boryl aldehydes via a novel 1,2-migration of the boronate group that proceeds with complete maintenance of stereochemical purity. B-Protected haloboronic acids containing dual sp3-hybridized C centers are readily accessible via this platform, and the herein demonstrated capacity for stereocontrolled iterative C(sp3) cross-coupling with this novel type of bifunctional reagent to access a medicinally important chiral small-molecule target in highly enantioenriched form represents a substantial advance for the building-block-based approach to synthesis.
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