Synthesis of 16,17-seco-steroids with iminomethyl-2-pyridine and aminomethylene-2-pyridine structures as chiral ligands for copper ions and molecular oxygen activation
作者:Angéla Magyar、Bruno Schönecker、János Wölfling、Gyula Schneider、Wolfgang Günther、Helmar Görls
DOI:10.1016/s0957-4166(03)00539-1
日期:2003.9
Starting from 16-oximino-3-methoxy-estra-1,3,5(10)-trien-17-one, the 16,17-seco-13alpha-carbaldehyde with a 16-nitrile function and its corresponding carboxylic acid have been synthesized via a Beckmann fragmentation. The corresponding 13alpha-amine is available by Curtius degradation of the carboxylic acid. Condensation of the carboxaldehyde with 2(aminomethyl)pyridine and the primary amine with pyridine-2-carboxaldehyde gave the corresponding iminomethyl-2-pyridine and the aminomethylene-2-pyridine compounds. Copper-mediated ligand hydroxylations with molecular oxygen were not successful. Reasons for this are discussed. (C) 2003 Elsevier Ltd. All rights reserved.