Pyridine → (R)-methyl 2-(3-(4-(2-fluorophenylsulfonamido)phenyl)isoxazole-5-carboxamido)-3-methylbutanoate

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To a solution of 500 mg (1.57 mmol) of (R)-methyl 2-(3-(4-aminophenyl)isoxazole-5-carboxamido)-3-methylbutanoate (example 151, step 3) in DCM, 1.2 eq of pyridine was added and stirred for 10 minutes, then 368 mg (1.89 mmol) 2-fluorobenzene-1-sulfonyl chloride was added and the reaction mixture was stirred for 3 hours. DCM was removed under vacuum, the reaction mixture was washed with 1NHCl and extracted with EtOAc. The organic layer was concentrated and purified by precipitation using DCM and petroleum ether to yield 410 mg (86%) of title compound. MS (ESI): m/z 476(M+H)+; 1HNMR (DMSO-d6, 300 MHz): δ 11.039 (s, 1H), 9.215 (d, 1H), 7.942 (m, 1H), 7.805 (d, 2H), 7.718 (m, 1H), 7.625 (s, 1H), 7.465 (m, 2H), 7.271(d, 2H), 4.314 (t, 1H), 3.690 (s, 3H), 2.228 (m, 1H), 0.971 (d, 6H).

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