N-(4-bromo-3-chlorophenyl)methanesulfonamide

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: N-(4-bromo-3-chlorophenyl)methanesulfonamide (B, 100.0 mg, 0.351 mmol), 4-chloro-3-fluorophenylboronic acid (73.4 mg, 0.421 mmol, L2 equiv.) and Pd(PPh3)4 (20.3 mg, 0.0176 mmol, 0.05 equiv.) was placed in a 50 mL round bottomed flask under a nitrogen atmosphere. To the flask were added 2M-Na1CO3 (1.0 mL, 2.0 mmol, 5.7 equiv.) and DME (4 mL) subsequently at ambient temperature. The mixture was heated under reflux conditions for 1 hours. The mixture was filtered through Celite (3 g) and the Celite was washed with EtOAc (70 mL). The solvent was removed under a reduced pressure. Obtained crude mixture was purified by column chromatography (SiO2=80 g, EtOAc/hexane=1:3˜1:1, Rf=0.4) to give the desired product as colorless crystals (compound 5 (designated PT-017). The mixture was heated under reflux conditions for 1 hours The mixture was filtered through Celite (3 g) the Celite was washed with EtOAc (70 mL) The solvent was removed under a reduced pressure Obtained crude mixture was purified by column chromatography (SiO2=80 g, EtOAc/hexane=1:3˜1:1, Rf=0.4)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In a 100 mL round bottomed flask 4-bromo-3-chloroaniline (A, 2.06 g, 10.0 mmol) was dissolve in pyridine (30 mL) at room temperature. Methanesulfonyl chloride (1.72 g, 15.0 mmol, 1.5 equiv) was added under an ice-water bath cooling. The ice bath was removed immediately after addition of the reagent. After stirring for 1.5 h, another methanesulfonyl chloride (0.57 g, 5.0 mmol, 0.5 equiv) was added at room temperature for the reaction to go to completion. After stirring for 0.5 h, the mixture was treated with H2O (50 mL) and extracted with EtOAc (50 mL×3). Combined organic layers were washed with brine (50 mL×2) and dried over Na2SO4. The solvent was removed in vacuo to give the crude material (very light brown solid, 5.32 g). The crude product was purified by a silica gel column chromatography (SiO2=80 g, EtOAc/hexane=1:1, Rf=0.3) to give the desired product as colorless crystals. The obtained crystals were recrystallized from EtOAc/hexane=1:2 (24 mL) to give the desired material [N-(4-bromo-3-chlorophenyl)methanesulfonamide (B)]. cooling The ice bath was removed immediately after addition of the reagent After stirring for 0.5 h extracted with EtOAc (50 mL×3) Combined organic layers were washed with brine (50 mL×2) dried over Na2SO4 The solvent was removed in vacuo to give the crude material (very light brown solid, 5.32 g) The crude product was purified by a silica gel column chromatography (SiO2=80 g, EtOAc/hexane=1:1, Rf=0.3)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of Intermediate 62A (0.843 g, 4.08 mmol) in THF (20.41 mL) was added triethylamine (5.69 mL, 40.8 mmol) followed by methanesulfonyl chloride (0.414 mL, 5.31 mmol). The reaction mixture was allowed to stir at room temperature for 3 days, then quenched with a saturated aqueous solution of NaHCO3 and diluted with EtOAc. The layers were separated and the aqueous phase was extracted with EtOAc (2×). The organic phases were combined, dried over Na2SO4, filtered, and concentrated to afford the title compound (245 mg, 0.861 mmol, 21.09% yield) as a white solid. HPLC Ret timej: 1.32 min. MS (ES): m/z=284.2 [M+H]−. Intermediate 62 was used in the synthesis of Example 212. quenched with a saturated aqueous solution of NaHCO3 diluted with EtOAc The layers were separated the aqueous phase was extracted with EtOAc (2×) dried over Na2SO4 filtered concentrated