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2004
Oxazine derivatives
R 0595
Direct Organocatalytic Enantioselective Mannich Reactions of Ketimines: An Apto Optically Active Quaternary α-Amino Acid Derivatives. — Ketimines
51- 139 proach
(I), bearing the protecting group on the nitrogen intrinsically bound to the α-aryl substituent of the imine, show high reactivity toward unmodified aldehydes (II) and (IV)
in the presence of chiral secondary amine catalyst PYMP. The resulting quaternary
α-amino acid ester derivatives are obtained in high yields and optically purities ranging
from 83 to 98% e.e. — (ZHUANG, W.; SAABY, S.; JOERGENSEN*, K. A.; Angew.
Chem., Int. Ed. 43 (2004) 34, 4476-4478; Dep. Chem., Univ. Aarhus, DK-8000
Aarhus, Den.; Eng.) — Klein
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