Optimization of Catalyst Structure for Asymmetric Propargylation of Aldehydes with Allenyltrichlorosilane

Optimization of Catalyst Structure for Asymmetric Propargylation of Aldehydes with Allenyltrichlorosilane
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烯基三氯硅烷醛不对称炔丙基化催化剂结构优化

DOI:
10.1002/adsc.202000936
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发表时间:
2020
影响因子:
5.4
通讯作者:
Malkov, Andrei V.
Malkov, Andrei V.
中科院分区:
化学2区
文献类型:
--
作者:
Vaganov, Vladimir Yu.;Fukazawa, Yasuaki;Kondratyev, Nikolay S.;Shipilovskikh, Sergei A.;Wheeler, Steven E.;Rubtsov, Aleksandr E.;Malkov, Andrei V.

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不对称丙基化催化剂的设计仍然是一项具有挑战性的任务,只有少数几种方法可以获得对映体富集的同丙基醇。在这项工作中,在先前报道的计算预测的指导下,测试了一组atropisomer bipyridineN,N ' - di氧化物作为路易斯碱催化剂与三氯乙烯基硅烷醛的不对称丙基化反应。催化剂的制备仅需简单的四个步骤,从现成的甲基酮开始。芳基取代衍生物被证明是高活性的,即使在1 mol%的负载下也显示出高水平的对映体控制。反应范围包括广泛的芳香、杂芳香和不饱和醛。新的计算证实,合成催化剂的关键立体决定过渡态结构与先前报道的模型结构相似。
The design of catalysts for asymmetric propargylations remains a challenging task, with only a handful of methods providing access to enantioenriched homopropargylic alcohols. In this work, guided by previously reported computational predictions, a set of atropisomeric bipyridineN,N’‐dioxides was tested as Lewis base catalysts for the asymmetric propargylation of aldehydes with trichloroallenylsilane. The catalysts are easily prepared in four simple steps starting from readily available methyl ketones. Aryl‐substituted derivatives proved to be highly active and showed a high level of enantiocontrol even at 1 mol% loading. The reaction scope includes a wide range of aromatic, heteroaromatic, and unsaturated aldehydes. New computations confirm that the key stereodetermining transition state structures for the synthesized catalysts are similar to those previously reported for the model structure.
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