N. Gautier et Rh. Dodd, THE PRACTICAL USE OF A GLYCINE ANION EQUIVALENT FOR THE PREPARATION OF 3-CARBOXY-1,2-DIHYDRO-1-OXOISOQUINOLINE, Synthetic communications, 28(20), 1998, pp. 3769-3777
Reaction of the dianion derived from N-Cbz-glycine ethyl ester with 2-
carboxybenzaldehyde gave the 2-(phthalidyl)glycinate derivative 8 as t
he major product. Successive treatment of the latter with LiOH and CF3
CO2H/CF3SO3H afforded the title compound in good overall yield.