Methyl iodide → Methyl 3-methyl-2-(N-methyl-5-(4-nitrophenyl)thiazole-2-carboxamido)butanoate

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To methyl 3-methyl-2-(5-(4-nitrophenyl)thiazole-2-carboxamido)butanoate (Intermediate 2, step C, 1 g) in DMSO (10 ml), to this cesium carbonate (1.346 gm) was added and the reaction mixture was stirred for 5 minutes. To this, methyliodide (0.258 ml) was added and the reaction mixture was stirred for 1 hour. Reaction mixture was quenched using water. The residue obtained was filtered and dried to obtain the title compound. Yield: 0.870 gm (83%); 1H NMR (DMSO-d6, 300 MHz): δ 8.65 (s, 1H), 8.33 (d, 2H), 8.08 (d, 2H), 6.18-4.75 (d, 1H), 3.68 (s, 3H), 3.46-2.96 (s, 3H), 2.38 (m, 1H), 1.03 (d, 3H), 0.91 (d, 3H); MS (ESI) m/z 378 [M+H]+, 400 [M+Na]+

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