Methyl 4-(4-oxo-chroman-3-ylidenemethyl)-benzoate

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

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of 260 (400 mg, 1.36 mmol) and benzenesulfonyl hydrazine (702 mg, 4.08 mmol) in DMF (7 ml) was stirred at 100° C. during 48 h. The solvent was evaporated and the residue was diluted in AcOEt, washed with NH4Cl sat., brine, dried over anhydrous MgSO4, filtered and concentrated. The crude residue was then purified by flash chromatography on silica gel (5% AcOEt/HEx) to afford the title compound 264 (170 mg, 42%) as a white solid. LRMS: 296.1 (Calc.); 297.0 (found). The solvent was evaporated the residue was diluted in AcOEt washed with NH4Cl sat., brine dried over anhydrous MgSO4 filtered concentrated The crude residue was then purified by flash chromatography on silica gel (5% AcOEt/HEx)

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of 260 (400 mg, 1.36 mmol) and benzenesulfonyl hydrazine (702 mg, 4.08 mmol) in DMF (7 ml) was stirred at 100° C. during 48 h. The solvent was evaporated and the residue was diluted in AcOEt, washed with NH4Cl sat., brine, dried over anhydrous MgSO4, filtered and concentrated. The crude residue was then purified by flash chromatography on silica gel (5% AcOEt/HEx) to afford the title compound 264 (170 mg, 42%) as a white solid. LRMS: 296.1 (Calc.); 297.0 (found). The solvent was evaporated the residue was diluted in AcOEt washed with NH4Cl sat., brine dried over anhydrous MgSO4 filtered concentrated The crude residue was then purified by flash chromatography on silica gel (5% AcOEt/HEx)

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

Procedure: Pd/C 10% was added to a suspension of 260 (200 mg, 0.68 mmol) in MeOH (40 ml) and DMA (10 ml) which was previously purged under vacuum. The reaction mixture was stirred during 4 h at room temperature. After evaporation of the MeOH, water was added to the oily residue and the precipitate obtained was filtered. The crude residue was then purified by flash chromatography on silica gel (5-8% AcOEt/Hex) to afford the title compound 263 (114 mg, 59%) as a white solid. LRMS: 282.1 (Calc.); 283.0 (found). was previously purged under vacuum After evaporation of the MeOH, water was added to the oily residue the precipitate obtained was filtered The crude residue was then purified by flash chromatography on silica gel (5-8% AcOEt/Hex)

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

Procedure: Pd/C 10% was added to a suspension of 260 (200 mg, 0.68 mmol) in MeOH (40 ml) and DMA (10 ml) which was previously purged under vacuum. The reaction mixture was stirred during 4 h at room temperature. After evaporation of the MeOH, water was added to the oily residue and the precipitate obtained was filtered. The crude residue was then purified by flash chromatography on silica gel (5-8% AcOEt/Hex) to afford the title compound 263 (114 mg, 59%) as a white solid. LRMS: 282.1 (Calc.); 283.0 (found). was previously purged under vacuum After evaporation of the MeOH, water was added to the oily residue the precipitate obtained was filtered The crude residue was then purified by flash chromatography on silica gel (5-8% AcOEt/Hex)

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Water (0.2 ml) and RhCl3.H2O (7 mg, 0.034 mmol) was added to a suspension of compound 260 (200 mg, 0.680 mmol) in EtOH (2 ml) and CHCL3 (2 ml). The reaction mixture was stirred 16 h at 70° C. The reaction mixture was cooled down and diluted in ethyl acetate, washed with brine, dried over anhydrous MgSO4, filtered and concentrated. The crude residue was then purified by flash chromatography on silica gel (0.5-1% MeOH/CH2Cl2) to afford the title compound 261 (118 mg, 59%) as a white solid. 1H NMR: (DMSO) δ (ppm): 8.45 (s, 1H), 8.03 (dd, J=7.9, 1.8 Hz, 1H), 7.87 (d, J=8.4 Hz, 2H), 7.83-7.77 (m, 1H), 7.65 (d, J=8.3 Hz, 1H), 7.50-7.43 (m3, 1H), 3.82 (s, 3H), 3.80 (s, 2H). The reaction mixture was cooled down washed with brine dried over anhydrous MgSO4 filtered concentrated The crude residue was then purified by flash chromatography on silica gel (0.5-1% MeOH/CH2Cl2)

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Water (0.2 ml) and RhCl3.H2O (7 mg, 0.034 mmol) was added to a suspension of compound 260 (200 mg, 0.680 mmol) in EtOH (2 ml) and CHCL3 (2 ml). The reaction mixture was stirred 16 h at 70° C. The reaction mixture was cooled down and diluted in ethyl acetate, washed with brine, dried over anhydrous MgSO4, filtered and concentrated. The crude residue was then purified by flash chromatography on silica gel (0.5-1% MeOH/CH2Cl2) to afford the title compound 261 (118 mg, 59%) as a white solid. 1H NMR: (DMSO) δ (ppm): 8.45 (s, 1H), 8.03 (dd, J=7.9, 1.8 Hz, 1H), 7.87 (d, J=8.4 Hz, 2H), 7.83-7.77 (m, 1H), 7.65 (d, J=8.3 Hz, 1H), 7.50-7.43 (m3, 1H), 3.82 (s, 3H), 3.80 (s, 2H). The reaction mixture was cooled down washed with brine dried over anhydrous MgSO4 filtered concentrated The crude residue was then purified by flash chromatography on silica gel (0.5-1% MeOH/CH2Cl2)

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

Procedure: Concentrated H2SO4 (2 ml) was slowly added to a solution of 4-chromanone (2.00 g, 13.50 mmol) and methyl-4-formylbenzoate (2.11 g, 12.86 mmol) in glacial acetic acid. The reaction mixture was stirred 16 h at room temperature. The solvent was concentrated to half volume the resulting precipitate was filtered and rinsed with ethyl acetate to afford the title compound 260 (3.11 g, 82%) as a purple solid. 1H NMR: (DMSO) δ (ppm): 8.05 (d, J=8.2 Hz, 2H), 7.90 (d, J=7.6 Hz, 1H), 7.79 (s, 1H), 7.64-7.59 (m, 3H), 7.15 (dd, J=7.6, 7.6 Hz, 1H), 7.07 (d, J=8.2 Hz, 1H), 5.43 (s, 2H), 3.89 (s, 3H). The solvent was concentrated to half volume the resulting precipitate was filtered rinsed with ethyl acetate

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

Procedure: Concentrated H2SO4 (2 ml) was slowly added to a solution of 4-chromanone (2.00 g, 13.50 mmol) and methyl-4-formylbenzoate (2.11 g, 12.86 mmol) in glacial acetic acid. The reaction mixture was stirred 16 h at room temperature. The solvent was concentrated to half volume the resulting precipitate was filtered and rinsed with ethyl acetate to afford the title compound 260 (3.11 g, 82%) as a purple solid. 1H NMR: (DMSO) δ (ppm): 8.05 (d, J=8.2 Hz, 2H), 7.90 (d, J=7.6 Hz, 1H), 7.79 (s, 1H), 7.64-7.59 (m, 3H), 7.15 (dd, J=7.6, 7.6 Hz, 1H), 7.07 (d, J=8.2 Hz, 1H), 5.43 (s, 2H), 3.89 (s, 3H). The solvent was concentrated to half volume the resulting precipitate was filtered rinsed with ethyl acetate

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of 260 (400 mg, 1.36 mmol) and benzenesulfonyl hydrazine (702 mg, 4.08 mmol) in DMF (7 ml) was stirred at 100° C. during 48 h. The solvent was evaporated and the residue was diluted in AcOEt, washed with NH4Cl sat., brine, dried over anhydrous MgSO4, filtered and concentrated. The crude residue was then purified by flash chromatography on silica gel (5% AcOEt/HEx)to afford the title compound 264 (170 mg, 42%) as a white solid. LRMS: 296.1 (Calc.); 297.0 (found). The solvent was evaporated the residue was diluted in AcOEt washed with NH4Cl sat., brine dried over anhydrous MgSO4 filtered concentrated The crude residue was then purified by flash chromatography on silica gel (5% AcOEt/HEx)to

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

Procedure: Pd/C 10% was added to a suspension of 260 (200 mg, 0.68 mmol) in MeOH (40 ml) and DMA (10 ml) which was previously purged under vacuum. The reaction mixture was stirred during 4 h at room temperature. After evaporation of the MeOH, water was added to the oily residue and the precipitate obtained was filtered. The crude residue was then purified by flash chromatography on silica gel (5-8% AcOEt/Hex)to afford the title compound 263 (114 mg, 59%) as a white solid. LRMS: 282.1 (Calc.); 283.0 (found). was previously purged under vacuum After evaporation of the MeOH, water was added to the oily residue the precipitate obtained was filtered The crude residue was then purified by flash chromatography on silica gel (5-8% AcOEt/Hex)to

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Water (0.2 ml) and RhCl3.H2O (7 mg, 0.034 mmol) was added to a suspension of compound 260 (200 mg, 0.680 mmol) in EtOH (2 ml) and CDCl3 (2 ml). The reaction mixture was stirred 16 h at 70° C. The reaction mixture was cooled down and diluted in ethyl acetate, washed with brine, dried over anhydrous MgSO4, filtered and concentrated. The crude residue was then purified by flash chromatography on silica gel (0.5-1% MeOH/CH2Cl2)to afford the title compound 261 (118 mg, 59%) as a white solid. 1H NMR: (DMSO) δ (ppm): 8.45 (s, 1H), 8.03 (dd, J=7.9, 1.8 Hz, 1H), 7.87 (d, J=8.4 Hz, 2H), 7.83-7.77(m, 1H), 7.65 (d, J=8.3 Hz, 1H), 7.50-7.43 (m3, 1H), 3.82 (s, 3H), 3.80 (s, 2H). The reaction mixture was cooled down washed with brine dried over anhydrous MgSO4 filtered concentrated The crude residue was then purified by flash chromatography on silica gel (0.5-1% MeOH/CH2Cl2)