Application of a chiral scaffolding ligand in catalytic enantioselective hydroformylation.

Application of a chiral scaffolding ligand in catalytic enantioselective hydroformylation.
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DOI:
10.1021/ja107433h
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发表时间:
2010-10-27
影响因子:
15
通讯作者:
Tan KL
Tan KL
中科院分区:
化学1区
文献类型:
--
作者:
Worthy AD;Joe CL;Lightburn TE;Tan KL

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通过PMP保护的烯丙基胺的对映选择性氢甲酰基化反应合成了β-氨基醛。该反应是通过使用共价和可逆地结合到基板的scalemic支架配体完成的。这些配体表现得像手性助剂,因为它们在加氢过程中共价连接到底物上;然而,与传统的不对称配体类似,它们可以以催化量使用。二取代烯烃的定向加氢在温和条件(35 °C和50 psi CO/H2)下发生,并且Z-烯烃提供优异的对映选择性(高达93%ee)。
The synthesis of β-amino-aldehydes has been achieved through enantioselective hydroformylation of PMP-protected allylic amines. The reaction is accomplished by using a scalemic scaffolding ligand that covalently and reversibly binds to the substrate. These ligands behave like chiral auxiliaries because they are covalently attached to the substrate during hydroformylation; however, similar to traditional asymmetric ligands, they can be used in catalytic quantities. The directed hydroformylation of disubstituted olefins occurs under mild conditions (35 °C and 50 psi CO/H2), and Z-olefins afford excellent enantioselectivities (up to 93% ee).
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