Enantioselective alpha-arylation of aldehydes via organo-SOMO catalysis. An ortho-selective arylation reaction based on an open-shell pathway.
Enantioselective alpha-arylation of aldehydes via organo-SOMO catalysis. An ortho-selective arylation reaction based on an open-shell pathway.
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DOI:
10.1021/ja9026902
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发表时间:
2009-08-26
影响因子:
15
通讯作者:
MacMillan, David W. C.
中科院分区:
文献类型:
--
作者:
Conrad, Jay C.;Kong, Jongrock;Laforteza, Brian N.;MacMillan, David W. C.
The intramolecular α-arylation of aldehydes has been accomplished using singly occupied molecular orbital (SOMO) catalysis. Selective oxidation of chiral enamines (formed by the condensation of an aldehyde and a secondary amine catalyst) leads to the formation of a 3π-electron radical species. These chiral SOMO-activated radical cations undergo enantioselective reaction with an array of pendent electron-rich aromatics and heterocycles thus efficiently providing cyclic α-aryl aldehyde products (10 examples: ≥70% yield and ≥90% ee). In accordance with our radical mechanism, when there is a choice between arylation at the ortho or para position of anisole substrates, we find that arylation proceeds selectively at the ortho position.
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