Determination of the nitrogen configuration in ephedrine N-boranes and a study of their assisted stereospecific deuteration of NH
摘要:
Ephedrine, pseudoephedrine and pseudoephedrine-methyl-ether react stereoselectively with BH3.DMS to give N-->BH3 adducts, which are N-epimers of stable configuration. The nitrogen configuration was established from NMR data. Assisted stereospecific deuteration of OH was demonstrated by comparison with the behaviour of pseudoephedrine-methyl-ether N-BH3 adducts. The analysis of the preferred conformers gave us an explanation of the observed stereochemistry.
Ephedrine, pseudoephedrine and pseudoephedrine-methyl-ether react stereoselectively with BH3.DMS to give N-->BH3 adducts, which are N-epimers of stable configuration. The nitrogen configuration was established from NMR data. Assisted stereospecific deuteration of OH was demonstrated by comparison with the behaviour of pseudoephedrine-methyl-ether N-BH3 adducts. The analysis of the preferred conformers gave us an explanation of the observed stereochemistry.