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Mitsunobu conversion to the ß-lactone and subsequent reaction with pyrazole is an example of a versatile route to N-protected ɑ-amino acids: Org. Synth. Coll., 9, 58 (1998) and references therein:/n
For a different synthesis of racemic pyrazoloaniline, see 2-Acetamidoacrylic acid, L01649./n