The present invention relates to a novel chiral phase-transfer catalyst, and a method for preparing an alpha-amino acid by using the same. According to the present invention, an alpha-amino acid of high optical purity could be synthesized in a high yield under an easy industrially applicable reaction condition by using a novel cinchona alkaloid compound as a chiral phase-transfer catalyst, and thus the present invention can be used as a key technique of the asymmetric alpha-amino acid synthesis and preparation field.

The present invention relates to a novel chiral phase-transfer catalyst, and a method for preparing an alpha-amino acid by using the same. According to the present invention, an alpha-amino acid of high optical purity could be synthesized in a high yield under an easy industrially applicable reaction condition by using a novel cinchona alkaloid compound as a chiral phase-transfer catalyst, and thus the present invention can be used as a key technique of the asymmetric alpha-amino acid synthesis and preparation field.

Provided herein are cinchonium betaine catalysts and methods of promoting asymmetric imine isomerization reactions using the same.

Provided herein are cinchonium betaine catalysts and methods of promoting asymmetric imine isomerization reactions using the same.

Provided herein are cinchonium betaine catalysts and methods of promoting asymmetric imine isomerization reactions using the same.

Provided herein are cinchonium betaine catalysts and methods of promoting asymmetric imine isomerization reactions using the same.

The present invention includes certain conchinine-derived phase-transfer catalysts of formula (I), compositions comprising the same, and methods of promoting asymmetric addition reactions using the same.

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The present invention includes certain conchinine-derived phase-transfer catalysts of formula (I), compositions comprising the same, and methods of promoting asymmetric addition reactions using the same.

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This invention relates to processes for the preparation of antiparasitic isoxazoline compounds enriched in an enantiomer using quinine-based chiral phase transfer catalyst. The invention also relates to novel quinine-based phase transfer catalysts and to a toluene solvent form of the isoxazoline compound of the invention.

This invention relates to processes for the preparation of antiparasitic isoxazoline compounds enriched in an enantiomer using quinine-based chiral phase transfer catalyst. The invention also relates to novel quinine-based phase transfer catalysts and to a toluene solvent form of the isoxazoline compound of the invention.