Optimization of Catalyst Structure for Asymmetric Propargylation of Aldehydes with Allenyltrichlorosilane
Optimization of Catalyst Structure for Asymmetric Propargylation of Aldehydes with Allenyltrichlorosilane
复制标题
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.
中科院分区:
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.
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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