5-Chloro-2-formylphenylboronic acid → 4-Chloro-2-formylphenylboronic Acid (contains varying amounts of Anhydride)

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The title compound 24a was synthesized following the 2-step procedure reported for the synthesis of 10-tert-butyl 6-methyl 3-chloro-13-cyclohexyl-7H-indolo[2,1-a][2]benzazepine-6,10-dicarboxylate 21a, using 5-chloro-2-formylphenylboronic acid in the first step, instead of 4-chloro-2-formylphenylboronic acid 34a, and was obtained with an overall yield of 70% as a yellowish solid; m/z 507 [M+H]+.

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