Ethyl 4-Amino-2-fluorobenzoate → 2-fluoro-4-{[4-(2-methoxy-5-methyl-benzenesulfonyl)-3,4-dihydro-2H-benzo[1,4]oxazine-6-carbonyl]-amino}-benzoic acid ethyl ester

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Reaction Steps

The title compound, MS (ISP)=501.1 (M+H)+, was produced as described in example 1, steps 1-6. Step 3 was performed using 2-methoxy-5-methylbenzenesulfonyl chloride, furnishing 4-(2-methoxy-5-methyl-benzenesulfonyl)-3,4-dihydro-2H-benzo[1,4]oxazine-6-carboxylic acid methyl ester, which was hydrolyzed in step 4, leading to 4-(2-methoxy-5-methyl-benzenesulfonyl)-3,4-dihydro-2H-benzo[1,4]oxazine-6-carboxylic acid. This was reacted with ethyl 4-amino-2-fluorobenzoate in step 5 and yielded 2-fluoro-4-{[4-(2-methoxy-5-methyl-benzenesulfonyl)-3,4-dihydro-2H-benzo[1,4]oxazine-6-carbonyl]-amino}-benzoic acid ethyl ester, which was hydrolyzed in step 6.

Provenance & Evidence