Acetic Acid → 2-Hydroxyquinoline

Participants

Reaction Steps

Synthesis of intermediates containing A2-77 (V═O) is shown in Scheme 54. Utilizing the procedure published by Doherty et. al (see WO 03/0999284), Wittig homologation of commercially available 2,4-dinitrobenzaldehyde (251) with ethyl (triphenylphosphoranylidene)-acetate results in propenoate 252. Catalytic hydrogenation in the presence of glacial acetic acid and ethanol results in the target 1H-quinolin-2-one 253 which, utilizing the same oxidation/reduction sequence as shown in Scheme 53 results in hydrazine 254 (R15, V═O) and iodide (255). At the conclusion of the synthesis that utilizes 254 or 255, reduction of the amide with LAH under standard conditions provides an optional synthesis of intermediates containing A2-77 (V═H2).

Provenance & Evidence