Nonheme Iron(III) Azide and Iron(III) Isothiocyanate Complexes: Radical Rebound Reactivity, Selectivity, and Catalysis.
Nonheme Iron(III) Azide and Iron(III) Isothiocyanate Complexes: Radical Rebound Reactivity, Selectivity, and Catalysis.
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DOI:
10.1021/jacs.2c07224
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发表时间:
2022-11-16
影响因子:
15
通讯作者:
Goldberg, David P.
中科院分区:
文献类型:
--
作者:
Yadav, Vishal;Wen, Lyupeng;Rodriguez, Rodolfo J.;Siegler, Maxime A.;Goldberg, David P.
The new nonheme iron complexes FeII(BNPAPh2O)(N3) (1), FeIII(BNPAPh2O)(OH)(N3) (2), FeII(BNPAPh2O)(OH) (3), FeIII(BNPAPh2O)(OH)(NCS) (4), FeII(BNPAPh2O)(NCS) (5), FeIII(BNPAPh2O)(NCS)2 (6), and FeIII(BNPAPh2O)(N3)2 (7) (BNPAPh2O = 2-(bis((6-(neopentylamino)pyridin-2-yl) methyl)amino)-1,1-diphenylethanolate) were synthesized and characterized by single crystal X-ray diffraction (XRD), as well as by 1H NMR, 57Fe Mössbauer and ATR-IR spectroscopies. Complex 2 was reacted with a series of carbon radicals, ArX3C• (ArX = p-X-C6H4), analogous to the proposed radical rebound step for nonheme iron hydroxylases and halogenases. The results show that for ArX3C• (X = Cl, H, tBu), only OH• transfer occurs to give ArX3COH. However, when X = OMe, a mixture of alcohol (ArX3COH) (30%) and azide (ArX3CN3) (40%) products was obtained. These data indicate that the rebound selectivity is influenced by the electron-rich nature of the carbon radicals for the azide complex. Reaction of 2 with Ph3C• in the presence of Sc3+ or H+ reverses the selectivity, giving only the azide product. In contrast to the mixed selectivity seen for 2, the reactivity of cis-FeIII(OH)(NCS) with the X = OMe radical derivative leads only to hydroxylation. Catalytic azidation was achieved with 1 as catalyst, λ3-azidoiodane as oxidant and azide source, and Ph3CH as test substrate, giving Ph3CN3 in 84% (TON = 8). These studies show that hydroxylation is favored over azidation for nonheme iron(III) complexes, but the nature of the carbon radical can alter this selectivity. If an OH• transfer pathway can be avoided, the FeIII(N3) complexes are capable of mediating both stoichiometric and catalytic azidation.
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影响因子:
12.9
作者:
Dunham NP;Arnold FH
通讯作者:
Arnold FH
影响因子:
4.6
作者:
Chan, Natalie H.;Gomez, Christian A.;Vennelakanti, Vyshnavi;Du, Qian;Kulik, Heather J.;Lewis, Jared C.
通讯作者:
Lewis, Jared C.
影响因子:
12.9
作者:
Huang, Xiongyi;Groves, John T.
通讯作者:
Groves, John T.
DOI:
10.1039/dt9840001349
发表时间:
1984-01-01
期刊:
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
影响因子:
--
作者:
ADDISON, AW;RAO, TN;VERSCHOOR, GC
通讯作者:
VERSCHOOR, GC
影响因子:
4.6
作者:
Cummins DC;Alvarado JG;Zaragoza JPT;Effendy Mubarak MQ;Lin YT;de Visser SP;Goldberg DP
通讯作者:
Goldberg DP