3-(Trifluoromethyl)benzenesulfonyl chloride → HCID 66789933, compound

Participants

Reaction Steps

2-Fluoro-4-{[4-(3-trifluoromethyl-benzenesulfonyl)-3,4-dihydro-2H-benzo[1,4]oxazine-6-carbonyl]-amino}-benzoic acid, MS (ISP): m/e=523.0 (M−H), was prepared as described for example 14, steps 1 to 8. Step 4 was performed using 4-amino-2-fluoro-benzoic acid ethyl ester, yielding 4-(4-benzyloxy-3-nitro-benzoylamino)-2-fluoro-benzoic acid ethyl ester, which was reduced to 4-(3-amino-4-hydroxy-benzoylamino)-2-fluoro-benzoic acid methyl ester in step 5 and cyclized to 4-[(3,4-dihydro-2H-benzo[1,4]oxazine-6-carbonyl)-amino]-2-fluoro-benzoic acid ethyl ester in step 6. Step 7 was performed using 3-trifluoromethyl-benzenesulfonyl chloride and yielded 2-fluoro-4-{[4-(3-trifluoromethyl-benzenesulfonyl)-3,4-dihydro-2H-benzo[1,4]oxazine-6-carbonyl]-amino}-benzoic acid ethyl ester, which was hydrolyzed in step 8.

Provenance & Evidence