Preparation of Dendritic and Non-Dendritic Styryl-Substituted Salens for Cross-Linking Suspension Copolymerization with Styrene and Multiple Use of the Corresponding Mn and Cr Complexes in Enantioselective Epoxidations and Hetero-Diels–Alder Reactions
作者:Holger Sellner、Jaana K. Karjalainen、Dieter Seebach
than 95% of the Salen incorporated being actually accessible for complexation (by elemental analysis). The polymer-bound Mn and Cr complexes were used as catalysts for epoxidations of six phenyl-substitutedolefins (m-CPBA/NMO; products 22a-f), and for dihydropyranone formation from the Danishefsky diene and aldehydes (PhCHO, C5H11CHO, C6H11CHO, products 23a-c). There are several remarkable features
Enantioselective water-soluble iron–porphyrin-catalyzed epoxidation with aqueous hydrogen peroxide and hydroxylation with iodobenzene diacetate
作者:Paul Le Maux、Hassan F. Srour、Gérard Simonneaux
DOI:10.1016/j.tet.2012.05.014
日期:2012.7
The asymmetric epoxidation of styrene derivatives by H2O2 (or UHP) to give optically active epoxides (ee up to 81%) and hydroxylation of alkanes to give optically active secondary alcohols (ee up to 78%) were carried out in methanol and water using chiral water-soluble ironporphyrins as catalysts.
H 2 O 2(或UHP)对苯乙烯衍生物进行不对称环氧化,得到旋光性环氧化物(ee高达81%),烷烃的羟基化反应得到旋光性仲醇(ee高达78%)在甲醇中进行。使用手性水溶性铁卟啉作为催化剂的水。
Nitration of Halterman porphyrin: a new route for fine tuning chiral iron and manganese porphyrins with application in epoxidation and hydroxylation reactions using hydrogen peroxide as oxidant
作者:Nesrine Amiri、Paul Le Maux、Hassan Srour、Habib Nasri、Gérard Simonneaux
DOI:10.1016/j.tet.2014.10.001
日期:2014.11
regioselective nitration of the phenyl groups of Halterman porphyrin, using NaNO2. These nitro-porphyrins can be reduced to aminoporphyrins and then N-dimethylated to give new optically active porphyrins. Applications to the asymmetric epoxidation of styrene derivatives by H2O2 to give optically active epoxides (ee up to 60%) and hydroxylation of alkanes to give optically active secondary alcohols (ee up to
报道了使用NaNO 2进行Halterman卟啉的苯基的区域选择性硝化的方法。可以将这些硝基卟啉还原为氨基卟啉,然后进行N-二甲基化以生成新的旋光卟啉。在有机溶剂(二氯甲烷)中应用H 2 O 2进行苯乙烯衍生物的不对称环氧化,得到旋光性环氧化物(ee最高60%),烷烃的羟基化得到旋光性仲醇(ee最高69%)。 /甲醇),使用手性铁和锰卟啉作为催化剂。
Enantioselective Manganese-Porphyrin-Catalyzed Epoxidation and C–H Hydroxylation with Hydrogen Peroxide in Water/Methanol Solutions
作者:Hassan Srour、Paul Le Maux、Gerard Simonneaux
DOI:10.1021/ic300457z
日期:2012.5.21
alkene and hydroxylation of arylalkane derivatives by H2O2 to give optically active epoxides (enantiomeric excess (ee) up to 68%) and alcohols (ee up to 57%), respectively, were carried out in water/methanol solutions using chiral water-soluble manganese porphyrins as catalysts.
在水/甲醇中分别进行烯烃的不对称环氧化和H 2 O 2对芳基烷烃衍生物的羟基化作用,分别得到光学活性的环氧化物(对映体过量(ee)高达68%)和醇(ee高达57%)。手性水溶性锰卟啉作为催化剂的溶液。
Peroxygenase‐Catalysed Epoxidation of Styrene Derivatives in Neat Reaction Media
作者:Marine C. R. Rauch、Florian Tieves、Caroline E. Paul、Isabel W. C. E. Arends、Miguel Alcalde、Frank Hollmann
DOI:10.1002/cctc.201901142
日期:2019.9.19
Biocatalytic oxyfunctionalisation reactions are traditionally conducted in aqueous media limiting their production yield. Here we report the application of a peroxygenase in neatreaction conditions reaching product concentrations of up to 360 mM.