Oxy-Allyl Cation Catalysis: An Enantioselective Electrophilic Activation Mode.
Oxy-Allyl Cation Catalysis: An Enantioselective Electrophilic Activation Mode.
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DOI:
10.1021/jacs.5b13041
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发表时间:
2016-02-24
影响因子:
15
通讯作者:
MacMillan DW
中科院分区:
文献类型:
--
作者:
Liu C;Oblak EZ;Vander Wal MN;Dilger AK;Almstead DK;MacMillan DW
A generic activation mode for asymmetric LUMO-lowering catalysis has been developed using the long-established principles of oxy-allyl cation chemistry. Here, the enantioselective conversion of racemic α-tosyloxy ketones to optically enriched α-indolic carbonyls has been accomplished using a new amino alcohol catalyst in the presence of electron-rich indole nucleophiles. Kinetic studies reveal that the rate-determining step in this SN1 pathway is the catalyst-mediated α-tosyloxy ketone deprotonation step to form an enantiodiscriminant oxy-allyl cation prior to the stereodefining nucleophilic addition event.
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