PREPARATION OF GLUTACONIC ACID DERIVATIVE

摘要

A useful intermediate, glutaconic acid ester derivative (III), is prepared by Michael-type condensation of thiazoleacetic acid derivative (I) with alkoxyacrylic acid derivative (II) in the presence of base. IMAGE (I) IMAGE (II) IMAGE (III) (wherein, R is amino or protected amino; R1 is an ester forming group; R2 is hydrogen, cyano, or esterified carboxy; R3 is hydrogen, cyano, or esterified carboxy; and R4 is lower alkyl or aralkyl).