An efficient synthesis of enantiopure (+)- and (−)-syn-1,3-amino alcohols with a norbornane framework and their application in the asymmetric addition of ZnEt2 to benzaldehyde

New 1,3-amino alcohols derived from enantiopure bridgehead β-aminobicyclo[2.2.2]oct-5-ene-2-carboxylic acids

Constrained enantiopure bicyclic β-amino acids derived from the asymmetric Diels-Alder reaction of the (R)-benzyl-4-(3-acryloyloxy-4,4-dimethyl-2-oxopyrrolidin-1-yl)-benzoate and the 1-(benzyloxycarbonylamino)cyclohexadiene provide original templates for the construction of new rigid enantiopure 1,3-amino alcohols.

N-acyldihydropyridones as synthetic intermediates. A stereoselective synthesis of acyclic amino alcohols containing multiple chiral centers

Various multisubstituted piperidines containing a phenyl group at C-2 can be opened regio- and stereoselectively with cyanogen bromide. The ring-opened products contain useful cyanamide and benzylic bromide functional groups. The benzyl bromide can be cleanly reduced, or substituted with various nucleophiles via an S(N)2 process to add additional heteroatoms stereoselectively. This methodology is useful for the stereoselective synthesis of uniquely substituted alkylamine derivatives containing multiple chiral centers and various functionality. Diastereomerically pure amino alcohols containing three to five contiguous stereocenters were prepared using this strategy.