N-[(4-methoxyphenyl)methyl]-1,3-thiazol-2-amine → 4-(4-Cyano-2-Methoxyphenyl)-6-Fluoro-N-(Thiazol-2-Yl)-3,4-Dihydro-2H-Benzo[B][1,4]Oxazine-7-Sulfonamide

참여 물질

반응 단계

To a vial charged with N-(4-methoxybenzyl)thiazol-2-amine (0.055 g, 0.250 mmol) was added THF (0.743 ml) and the mixture cooled in an ice water bath prior to the addition of lithium bis(trimethylsilyl)amide, 1.0M solution in tetrahydrofuran (0.273 ml, 0.273 mmol), faster than dropwise. After 15 mins of stirring a solution of 4-(4-cyano-2-methoxyphenyl)-6-fluoro-3,4-dihydro-2H-benzo[b][1,4]oxazine-7-sulfonyl chloride (0.087 g, 0.227 mmol) in THF (0.6 ml) was added dropwise, then washed with 0.2 ml THF and added. The mixture was stirred for 1 hr (ice melt) providing a brown solution and product as the primary species according to LC-MS (m/z=567) with consumption of starting material. The solution was added to ice, the mixture diluted with EtOAc and extracted with water and EtOAc. The combined organics were dried with Na2SO4, filtered, and dried under reduced pressure. To the crude material, a light yellow/brown foam (115 mg) was added DCM (5 ml) and TFA (1.5 ml) and the mixture stirred at room temp for 60 mins affording about 85% conversion to desired product. Stirring for another hr did not afford further conversion. Additional TFA (1 ml) was added and stirring at room temperature continued. After another hr LC-MS indicated no further conversion.

출처 및 근거