Mechanism of the enantioselective oxidation of racemic secondary alcohols catalyzed by chiral Mn(III)-salen complexes.
Mechanism of the enantioselective oxidation of racemic secondary alcohols catalyzed by chiral Mn(III)-salen complexes.
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DOI:
10.1021/ja103103d
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发表时间:
2010-08-18
影响因子:
15
通讯作者:
Corey, E. J.
中科院分区:
文献类型:
--
作者:
Brown, M. Kevin;Blewett, Megan M.;Colombe, James R.;Corey, E. J.
The experiments described here clarify the mechanism and origin of the enantioselectivity of the oxidation of racemic secondary alcohols catalyzed by chiral Mn(III)–salen complexes using HOBr, Br2/H2O/KOAc or PhI(OAc)2/H2O/KBr as a stoichiometric oxidant. Key points of the proposed pathway include (1) the formation of a Mn(V)–salen dibromide, (2) its subsequent reaction with the alcohol to give an alkoxy-Mn(V) species, and (3) carbonyl-forming elimination to produce the ketone via a highly organized transition state with intramolecular transfer of hydrogen from carbon to an oxygen of the salen ligand.
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影响因子:
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通讯作者:
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通讯作者:
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