6-bromospiro[3H-chromene-2,1'-cyclohexane]-4-one

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

Procedure: To a solution of 6-bromospiro[chroman-2,1′-cyclohexan]-4-one (383 mg, 1.30 mmol) in anhydrous THF (10 mL) at −78° C. is added a solution of vinylmagnesiun bromide in THF (1 M, 1.95 mL, 1.95 mmol) dropwise within 10 min. The reaction temperature is allowed to warm to rt and stirred for another 2 h. The reaction is chilled to 0° C. and quenched with sat. aq. NH4Cl, and extracted with ethyl acetate (2×30 mL). The combined organic phases are washed with H2O, brine, dried over Na2SO4, and filtered. The filtrate is concentrated to give crude 6-bromo-4-vinylspiro[chroman-2,1′-cyclohexan]-4-ol as an oil, which is used for the next step without further purification. MS ESI +ve m/z 305 (M+H—H2O)+. The reaction is chilled to 0° C. quenched with sat. aq. NH4Cl extracted with ethyl acetate (2×30 mL) The combined organic phases are washed with H2O, brine dried over Na2SO4 filtered The filtrate is concentrated

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

Procedure: The compound of 2-methylpropane-2-sulfinamide (29.54 g, 244.2 mmol) was added the solution of 6-bromospiro[chroman-2,1′-cyclohexan]-4-one (78.97 g, 268.6 mmol) in dry THF (900 mL), and then tetraisopropoxytitanium (193.1 g, 488.3 mmol) was added, The reaction mixture was reflux overnight. The mixture was removed in vacuo, and then quenched by brine, extracted with ethyl acetate. The ethyl acetate was dried over anhydrous Na2SO4, filtered, and evaporated to give (E)-N-(6-bromospiro[chroman-2,1′-cyclohexane]-4-ylidene)-2-methylpropane-2-sulfinamide (50 g, 40%). 1H NMR (CDCl3): 1.30 (s, 10H), 1.51 (m, 5H), 1.62 (m, 4H), 1.83 (d, 2H), 3.07(d, 1H), 3.43 (d, 1H), 5.29 (s, 2H), 6.79 (d, 1H), 7.41 (dd, 1H), 7.96 (d, 1H). The reaction mixture was reflux overnight The mixture was removed in vacuo quenched by brine extracted with ethyl acetate The ethyl acetate was dried over anhydrous Na2SO4 filtered evaporated

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

Procedure: To a solution of 1-(5-bromo-2-hydroxy-phenyl)-ethanone (60 g, 280 mmol) and pyrrolidine (37.8 g, 532 mmol) in methanol (1200 mL) was added cyclohexanone (55 g, 560 mmol), and the mixture was reflux overnight. The solvent was removed in vacuo, and then added H2O and HCl to make the mixture to PH=1, extracted with ethyl acetate. The organic layer was dried over anhydrous Na2SO4, filtered, and evaporated to give 6-bromospiro[chroman-2,1′-cyclohexan]-4-one (90 g, 100%). 1H NMR (CDCl3): 1.49 (d, 4H), 1.64 (d, 4H), 1.83 (s, 1H), 1.98 (d, 2H), 2.11 (t, 1H), 2.31 (s, 1H), 2.68 (s, 1H), 6.87 (d, 1H), 7.50 (d, 1H), 7.92 (s, 1H). the mixture was reflux overnight The solvent was removed in vacuo extracted with ethyl acetate The organic layer was dried over anhydrous Na2SO4 filtered evaporated

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

Procedure: To a solution of 6-bromospiro[chroman-2,1′-cyclohexan]-4-one (379 mg, 1.28 mmol) in anhydrous DCM (10 mL) was added TiCl4 (1 M solution in DCM, 2.6 mL, 2.6 mmol) dropwise within 15 min at rt. The mixture was stirred for another 1 h after the addition. To this mixture was added bis-trimethylsilylcarbodiimide (0.525 g, 0.63 mL, 2.82 mmol) dropwise. The resulting mixture was stirred for another 18 h after the addition. The reaction mixture was poured into ice-water (50 g) and extracted with DCM (3×30 mL). The combined organic phases were dried over anhydrous Na2SO4, filtered, and concentrated to give N-(6-bromospiro[chroman-2,1′-cyclohexane]-4-ylidene)cyanamide as a light brown solid (410 mg), which was used in the next step without further purification. MS ESI +ve m/z 319 (M+H)+. after the addition The resulting mixture was stirred for another 18 h after the addition extracted with DCM (3×30 mL) The combined organic phases were dried over anhydrous Na2SO4 filtered concentrated

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In a 50 mL round bottom flask was added 1-(5-bromo-2-hydroxyphenyl)ethanone (2.0 g, 9.3 mmol), followed by cyclohexanone (0.96 mL, 9.3 mmol). MeOH (20 mL) was added to give a clear solution followed by pyrrolidine (1 mL). A condenser was attached to the flask, and the resulting solution was heated at 60° C. overnight. MeOH was removed and the residue was redissolved in EtOAc (30 mL), washed with 1 N NaOH (10 mL) and 1 N HCl (10 mL), and then dried over Na2SO4. Solvent was removed in vacuo to give 6-bromospiro[chroman-2,1′-cyclohexan]-4-one (2.25 g, 82%), which is used for the next step without purification. to give a clear solution A condenser was attached to the flask MeOH was removed the residue was redissolved in EtOAc (30 mL) washed with 1 N NaOH (10 mL) and 1 N HCl (10 mL) dried over Na2SO4 Solvent was removed in vacuo

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

Procedure: To a solution of 6-bromospiro[chroman-2,1′-cyclohexan]-4-one (383 mg, 1.30 mmol) in anhydrous THF (10 mL) at −78° C. is added a solution of vinylmagnesiun bromide in THF (1 M, 1.95 mL, 1.95 mmol) dropwise within 10 min. The reaction temperature is allowed to warm to rt and stirred for another 2 h. The reaction is chilled to 0° C. and quenched with sat. aq. NH4Cl, and extracted with ethyl acetate (2×30 mL). The combined organic phases are washed with H2O, brine, dried over Na2SO4, and filtered. The filtrate is concentrated to give crude 6-bromo-4-vinylspiro[chroman-2,1′-cyclohexan]-4-ol as an oil, which is used for the next step without further purification. MS ESI+ve m/z 305 (M+H—H2O)+. The reaction is chilled to 0° C. quenched with sat. aq. NH4Cl extracted with ethyl acetate (2×30 mL) The combined organic phases are washed with H2O, brine dried over Na2SO4 filtered The filtrate is concentrated

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

Procedure: The compound of 2-methylpropane-2-sulfinamide (29.54 g, 244.2 mmol) was added the solution of 6-bromospiro[chroman-2,1′-cyclohexan]-4-one (78.97 g, 268.6 mmol) in dry THF (900 mL), and then tetraisopropoxytitanium (193.1 g, 488.3 mmol) was added, The reaction mixture was reflux overnight. The mixture was removed in vacuo, and then quenched by brine, extracted with ethyl acetate. The ethyl acetate was dried over anhydrous Na2SO4, filtered, and evaporated to give (E)-N-(6-bromospiro[chroman-2,1′-cyclohexane]-4-ylidene)-2-methylpropane-2-sulfinamide (50 g, 40%). 1H NMR (CDCl3): 1.30 (s, 10H), 1.51 (m, 5H), 1.62 (m, 4H), 1.83 (d, 2H), 3.07 (d, 1H), 3.43 (d, 1H), 5.29 (s, 2H), 6.79 (d, 1H), 7.41 (dd, 1H), 7.96 (d, 1H). The reaction mixture was reflux overnight The mixture was removed in vacuo quenched by brine extracted with ethyl acetate The ethyl acetate was dried over anhydrous Na2SO4 filtered evaporated

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

Procedure: To a solution of 1-(5-bromo-2-hydroxy-phenyl)-ethanone (60 g, 280 mmol) and pyrrolidine (37.8 g, 532 mmol) in methanol (1200 mL) was added cyclohexanone (55 g, 560 mmol), and the mixture was reflux overnight. The solvent was removed in vacuo, and then added H2O and HCl to make the mixture to PH=1, extracted with ethyl acetate. The organic layer was dried over anhydrous Na2SO4, filtered, and evaporated to give 6-bromospiro[chroman-2,1′-cyclohexan]-4-one (90 g, 100%). 1H NMR (CDCl3): 1.49 (d, 4H), 1.64 (d, 4H), 1.83 (s, 1H), 1.98 (d, 2H), 2.11 (t, 1H), 2.31 (s, 1H), 2.68 (s, 1H), 6.87 (d, 1H), 7.50 (d, 1H), 7.92 (s, 1H). the mixture was reflux overnight The solvent was removed in vacuo extracted with ethyl acetate The organic layer was dried over anhydrous Na2SO4 filtered evaporated

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

Procedure: To a solution of 6-bromospiro[chroman-2,1′-cyclohexan]-4-one (379 mg, 1.28 mmol) in anhydrous DCM (10 mL) was added TiCl4 (1 M solution in DCM, 2.6 mL, 2.6 mmol) dropwise within 15 min at rt. The mixture was stirred for another 1 h after the addition. To this mixture was added bis-trimethylsilylcarbodiimide (0.525 g, 0.63 mL, 2.82 mmol) dropwise. The resulting mixture was stirred for another 18 h after the addition. The reaction mixture was poured into ice-water (50 g) and extracted with DCM (3×30 mL). The combined organic phases were dried over anhydrous Na2SO4, filtered, and concentrated to give N-(6-bromospiro[chroman-2,1′-cyclohexane]-4-ylidene)cyanamide as a light brown solid (410 mg), which was used in the next step without further purification. MS ESI+ve m/z 319 (M+H)+. after the addition The resulting mixture was stirred for another 18 h after the addition extracted with DCM (3×30 mL) The combined organic phases were dried over anhydrous Na2SO4 filtered concentrated

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: In a 50 mL round bottom flask was added 1-(5-bromo-2-hydroxyphenyl)ethanone (2.0 g, 9.3 mmol), followed by cyclohexanone (0.96 mL, 9.3 mmol). MeOH (20 mL) was added to give a clear solution followed by pyrrolidine (1 mL). A condenser was attached to the flask, and the resulting solution was heated at 60° C. overnight. MeOH was removed and the residue was redissolved in EtOAc (30 mL), washed with 1 N NaOH (10 mL) and 1 N HCl (10 mL), and then dried over Na2SO4. Solvent was removed in vacuo to give 6-bromospiro[chroman-2,1′-cyclohexan]-4-one (2.25 g, 82%), which is used for the next step without purification. to give a clear solution A condenser was attached to the flask MeOH was removed the residue was redissolved in EtOAc (30 mL) washed with 1 N NaOH (10 mL) and 1 N HCl (10 mL) dried over Na2SO4 Solvent was removed in vacuo