Application of modern NMR techniques for conformation analysis and assignment of NMR parameters of biologically active compounds

Abstract The use of some modern NMR techniques (mainly two-dimensional NMR spectroscopy) for structural studies (in particular conformational analysis) and so-called “ ab initio ” assignment of NMR parameters ( i.e. without using prior information) is illustrated on some examples of organic molecules, such as the alkaloids a-ergokryptine, bromokryptine and a-isosparteine methiodide. In this way, complete assignment of the proton and carbon-13 NMR parameters was achieved and information concerning the molecular conformations in solution was obtained.