Ethanol → HCID 178518942, compound

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Reaction Steps

For example, as outlined in Scheme I, 1,2,4-benzene tricarboxylic anhydride 1 may be reacted with hydrazine in a suitable solvent, e.g., ethanol, isopropyl alcohol, or n-methyl-2-pyrrolidinone, to produce dihydroxy-phthalazine 2. Compound 2 may then be reacted with SOCl2 and POCl3 to produce a trichloride intermediate that is reacted immediately with an amine X1X2NH (where X1 and X2 are, e.g., hydrogen, alkyl, aryl, etc.) to produce an amide compound 3. Compound 3 may then be reacted with NaI and HI in a suitable solvent, e.g., acetone, to produce a di-iodo compound 4. Compound 4 may then be further reacted with a suitable nucleophile in a suitable solvent to form a mixture of the two correspondent regioisomers 5 and 6. Replacement of any remaining iodine atoms may be achieved using standard nucleophilic substitution and/or transition metal reactions known to one of skill in the art, for example, Stille and Suzuki type reactions.

Provenance & Evidence