R. Kuwano et al., Catalytic asymmetric hydrogenation of 1-aza-2-cycloalkene-2-carboxylates catalyzed by a trans-chelating chiral diphosphine PhTRAP-rhodium complex, TETRAHEDR L, 40(51), 1999, pp. 9045-9049
A rhodium complex coordinated with a trans-chelating chiral diphosphine (S,
S)-(R,R)-PhTRAP was an effective catalyst for asymmetric hydrogenation of N
-acyl-1-aza-2-cycloalkene-2-carboxylates, which gave the corresponding prot
ected cyclic alpha-amino acids with 73-97% ee. (C) 1999 Elsevier Science Lt
d. All rights reserved.