Glycine → 2-(2,6-Dinitrobenzamido)acetic acid

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As shown in scheme G, 2,6-dinitrobenzoyl chloride prepared from 2,6-dinitrobenzoic acid is treated with glycine in the presence of sodium carbonate to yield 2-(2,6-dinitrobenzamido)acetic acid (intermediate 10). Treatment of intermediate 10 either with K18F or K19F gave 2-(2-fluoro-6-nitrobenzamido)acetic acid, which on reduction with indium powder in the presence of either acetic acid or acetic anhydride-acetic acid gave the corresponding 2-(2-amino-6-fluorobenzamido)acetic acid (compound 8) or 2-(2-acetamido-6-fluorobenzamido)acetic acid (compound 9) respectively.

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