The synthesis of oxazaborolidines from amides derived from ephedrine and pseudoephedrine by treatment with BH3-THF is reported. The reaction affords chiral oxazaborolidines with nitrogen atom substituents of different steric requirements enlarging the potential of new oxazaborolidines prepared from readily available ephedrines. These may be useful in asymmetric synthesis.
The synthesis of oxazaborolidines from amides derived from ephedrine and pseudoephedrine by treatment with BH3-THF is reported. The reaction affords chiral oxazaborolidines with nitrogen atom substituents of different steric requirements enlarging the potential of new oxazaborolidines prepared from readily available ephedrines. These may be useful in asymmetric synthesis.