REVERSAL OF THE STEREOCHEMICAL COURSE OF THE ADDITION OF PHENYLMAGNESIUM BROMIDE TO N-BENZYLIMINES DERIVED FROM R-GLYCERALDEHYDE DEPENDING ON THE O-PROTECTING GROUP AND ITS APPLICATION TO THE SYNTHESIS OF BOTHENANTIOMERS OF PHENYLGLYCINE
R. Badorrey et al., REVERSAL OF THE STEREOCHEMICAL COURSE OF THE ADDITION OF PHENYLMAGNESIUM BROMIDE TO N-BENZYLIMINES DERIVED FROM R-GLYCERALDEHYDE DEPENDING ON THE O-PROTECTING GROUP AND ITS APPLICATION TO THE SYNTHESIS OF BOTHENANTIOMERS OF PHENYLGLYCINE, Tetrahedron, 53(4), 1997, pp. 1411-1416
The N-Benzyl imines derived from 2,3-di-O-benzyl-D-glyceraldehyde and
2,3-di-O-isopropylidene-D-glyceraldehyde reacted with phenylmagnesium
bromide to afford fully protected aminodiols with total diastereoselec
tivity. The stereochemical course of the addition reaction depends on
the nature of the O-protecting group. These compounds can be easily tr
ansformed to enantiomerically pure (R) and (S)alpha-phenylglycine. (C)
1997, Elsevier Science Ltd.