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PRECIPITATION-INDUCED ASYMMETRIC TRANSFORMATION OF CHIRAL¹ALPHA-AMINO ACIDS AND SALTS THEREOF
PRECIPITATION-INDUCED ASYMMETRIC TRANSFORMATION OF CHIRAL¹ALPHA-AMINO ACIDS AND SALTS THEREOF
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机译:沉淀诱导的手性α-氨基氨基酸及其盐的不对称转化
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摘要
The present invention provides a method for resolving a mixture of optically active isomers of an alpha -amino acid to obtain the preferred optically active isomer. The mixture of isomers is contacted with at least one chiral resolving agent in an organic acid, which is at least a partial solvent for the alpha -amino acid, and in the presence of a mineral acid, which is present in a quantity which does not protonate the NH2 functionality of the alpha -amino acid to an extent that diastereomer interconversion is substantially prevented, and in the presence of a catalytic amount of an aromatic aldehyde. The contacting results in simultaneous resolution of a desired diastereomer and interconversion of the remaining undesired diastereomer, to provide a very high yield of the desired diastereomer having a very high optical purity. IMAGE
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