1,2-Dibromoethane → 4-(5-chloro-2-methoxy-benzenesulfonyl)-8-trifluoromethyl-3,4-dihydro-2H-benzo[1,4]oxazine-6-carboxylic acid methyl ester

Participants

Reaction Steps

The title compound, MS (ISP)=569.0 (M−H)−, was produced in analogy with example 36, steps 1-4. Step 1 was performed using 3-(5-chloro-2-methoxy-benzenesulfonylamino)-4-hydroxy-5-trifluoromethyl-benzoic acid methyl ester (example 40, step 2) and 1,2-dibromoethane, yielding 4-(5-chloro-2-methoxy-benzenesulfonyl)-8-trifluoromethyl-3,4-dihydro-2H-benzo[1,4]oxazine-6-carboxylic acid methyl ester, which was hydrolyzed in step 2 to afford 4-(5-chloro-2-methoxy-benzenesulfonyl)-8-trifluoromethyl-3,4-dihydro-2H-benzo[1,4]oxazine-6-carboxylic acid. This was reacted with ethyl 4-aminobenzoate in step 3 to produce 4-{[4-(5-chloro-2-methoxy-benzenesulfonyl)-8-trifluoromethyl-3,4-dihydro-2H-benzo[1,4]oxazine-6-carbonyl]-amino}-benzoic acid ethyl ester, which was hydrolyzed in step 4.

Provenance & Evidence