1. Friedrich-Alexander University Erlangen-Nuernberg Department of Chemistry and Pharmacy Organic Chemistry II Nikolaus-Fiebiger Str. 10 91058 Erlangen Germany
2. Institute of Chemistry Organic Chemistry Martin-Luther-University Halle-Wittenberg Kurt-Mothes-Strasse 2 06120 Halle Germany
3. South Ural State University pr. Lenina 76 454080 Chelyabinsk Russia