3,3'-Dichloro-4'-[2-(4-ethyl-3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-6-yl)-3,3,3-trifluoro-2-hydroxy-1-methyl-propyl]-biphenyl-4-carboxylic acid methyl ester → 3,3'-Dichloro-4'-[2-(4-ethyl-3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-6-yl)-3,3,3-trifluoro-2-hydroxy-1-methyl-propyl]-biphenyl-4-carboxylic acid

Participants

Reaction Steps

In analogy to Example 56, Step 6, 3,3′-dichloro-4′-[2-(4-ethyl-3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-6-yl)-3,3,3-trifluoro-2-hydroxy-1-methyl-propyl]-biphenyl-4-carboxylic acid methyl ester (110 mg, 0.19 mmol) was hydrolyzed (3 h, 65° C.). The product was treated with heptane for 17 h, filtered and dried to give the title compound as a white solid. MS (m/e, ISP neg. ion)=566.2 [M−H+].

Provenance & Evidence