Enantioselective synthesis of β-amino acids based on BINAP—ruthenium(II) catalyzed hydrogenation
摘要:
BINAP-Ru(II) catalyzed hydrogenation of beta-substituted (E)-beta-(acylamino)acrylic acids allows efficient enantioselective synthesis of beta-amino acids. The Z double bond isomers which possess an intramolecular hydrogen bond between amide and ester groups are more reactive but are hydrogenated with poor enantioselectivity. BINAP-Rh(I) complexes afford only moderate stereoselectivity with the opposite sense of enantioselection.
Enantioselective synthesis of β-amino acids based on BINAP—ruthenium(II) catalyzed hydrogenation
摘要:
BINAP-Ru(II) catalyzed hydrogenation of beta-substituted (E)-beta-(acylamino)acrylic acids allows efficient enantioselective synthesis of beta-amino acids. The Z double bond isomers which possess an intramolecular hydrogen bond between amide and ester groups are more reactive but are hydrogenated with poor enantioselectivity. BINAP-Rh(I) complexes afford only moderate stereoselectivity with the opposite sense of enantioselection.
The present invention provides a compound represented by the formula (I): wherein R
1
is a C?1-6#191 alkyl group optionally substituted by a C?3-10#191 cycloalkyl group, R
2
is a C?2-6#191 alkyl group, R
3
is a hydrogen atom, a C?1-6#191 alkyl group or a halogen atom, and X is —OR
6
or —NR
4
R
5
wherein R
4
and R
6
are each independently a hydrogen atom, an optionally substituted hydrocarbon group or an optionally substituted heterocyclic group, R
5
is an optionally substituted hydrocarbon group, an optionally substituted heterocyclic group or an optionally substituted hydroxy group, or R
4
and R
5
optionally form, together with the adjacent nitrogen atom, an optionally substituted nitrogen-containing heterocycle, or a salt thereof. The compound of the present invention has a superior peptidase inhibitory action and is useful as an agent for the prophylaxis or treatment of diabetes and the like.