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Fe(PyTACN)‐Catalyzed cis ‐Dihydroxylation of Olefins with Hydrogen Peroxide
Author(s) -
Prat Irene,
Font David,
Company Anna,
Junge Kathrin,
Ribas Xavi,
Beller Matthias,
Costas Miquel
Publication year - 2013
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.201200938
Subject(s) - dihydroxylation , chemistry , hydrogen peroxide , catalysis , alkene , hydroxylation , epoxide , pyridine , medicinal chemistry , olefin fiber , reagent , selectivity , organic chemistry , enantioselective synthesis , enzyme
A family of iron complexes with general formula [Fe(II)( R,Y,X PyTACN)(CF 3 SO 3 ) 2 ], where R,Y,X PyTACN=1‐[2′‐(4‐Y‐6‐X‐pyridyl)methyl]‐4,7‐dialkyl‐1,4,7‐triazacyclononane, X and Y refer to the groups at positions 4 and 6 of the pyridine, respectively, and R refers to the alkyl substitution at N‐4 and N‐7 of the triazacyclononane ring, are shown to be catalysts for efficient and selective alkene oxidation (epoxidation and cis ‐dihydroxylation) employing hydrogen peroxide as oxidant. Complex [Fe(II)( Me,Me,H PyTACN)(CF 3 SO 3 ) 2 ] ( 7 ), was identified as the most efficient and selective cis ‐dihydroxylation catalyst among the family. The high activity of 7 allows the oxidation of alkenes to proceed rapidly (30 min) at room temperature and under conditions where the olefin is not used in large amounts but instead is the limiting reagent. In the presence of 3 mol% of 7 , 2 equiv. of H 2 O 2 as oxidant and 15 equiv. of water, in acetonitrile solution, alkenes are cis ‐dihydroxylated reaching yields that might be interesting for synthetic purposes. Competition experiments show that 7 exhibits preferential selectivity towards the oxidation of cis olefins over the trans analogues, and also affords better yields and high [ syn ‐diol]/[epoxide] ratios when cis olefins are oxidized. For aliphatic substrates, reaction yields attained with the present system compare favourably with state of the art Fe‐catalyzed cis ‐dihydroxylation systems, and it can be regarded as an attractive complement to the iron and manganese systems described recently and which show optimum activity against electron‐deficient and aromatic olefins.