Novel chiral phase-transfer catalyst, and method for preparing a-amino acid by using same

A cinchona-alkaloid compound represented by Formula 1 below:

• wherein,
• X is selected from the group consisting of —CH2—, —C(OH)H—, —C(═O)—, —O—, —S—, —S(═O)—, and —S(O2)—;
• R is
• R1 is selected from the group consisting of hydrogen, C1 to C10 alkyl, and C1 to C5 alkoxy;
• R2 is vinyl or ethyl;
• R3 is selected from the group consisting of hydrogen, C1 to C10 alkyl, allyl, C5 to C10 aryl, naphthalen-1-yl-methyl, and anthracen-9-yl-methyl;
• and
• Y− is selected from the group consisting of:
• halogen anion of, fluoride, chloride, bromide, and iodide, IO4−, CIO4−, R4SO3−, trifluoromethane sulfonate (OTf−) and HSO4−, wherein R4 is C1-C4 alkyl or C5-C10 aryl.