SYNTHESIS OF (S)-2-AMINO-1,1-DIPHENYLBUTAN-4-OL - CONVERSION OF AN ALPHA-AMINO-ACID INTO AN ALPHA-(DIPHENYLMETHYL) AMINE WITHOUT LOSS OF OPTICAL PURITY
Ph. Boyle et al., SYNTHESIS OF (S)-2-AMINO-1,1-DIPHENYLBUTAN-4-OL - CONVERSION OF AN ALPHA-AMINO-ACID INTO AN ALPHA-(DIPHENYLMETHYL) AMINE WITHOUT LOSS OF OPTICAL PURITY, Tetrahedron : asymmetry, 6(11), 1995, pp. 2819-2828
The title amino-alcohol 4 is an intermediate for the preparation of ch
iral bicyclic amidines and guanidines, and also for polyamines with po
tential as ligands in enantioselective catalysis. It has been synthesi
zed from (S)-methionine 1 via (S)-homoserine lactone 2 and amino-diol
3. Hydrogenolysis of the doubly benzylic hydroxyl group in 3 proved no
n-trivial, but was eventually achieved through the application of cata
lytic transfer methodology to the bis-acetyl derivative 14.