methyl 3-(3-chloro-2,4-dihydroxyphenyl)propanoate

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

Procedure: Diketene (0.7 ml, 9.1 mmol) was added dropwise to a stirred solution of 5a (1.0 g, 4.3 mmol) in 7 ml of methanesulfonic acid. The resultant solution was heated at 70° C. for 5 min and cooled. Methanol (20 ml) was added and the reaction was heated to boiling; this treatment esterified small amount of free acid formed during the cyclization step. Methanol was evaporated and water was added to precipitate the product. The crude material was chromatographed on silica eluting with ethyl acetate. Concentration of the pure product fractions and drying under vacuum afforded 0.82 g (64%) of the desired product as a pale yellow solid. 1H NMR (DMSO-d6): δ 10.45 (s, 1H), 7.50 (s, 1H), 6.24 (s, 1H), 3.59 (s, 2.93 (t, J=7.5 Hz, 2H), 2.62 (t, J=7.5 Hz, 2H), 2.38 (s, 3H). cooled the reaction was heated to boiling formed during the cyclization step Methanol was evaporated water was added to precipitate the product The crude material was chromatographed on silica eluting with ethyl acetate Concentration of the pure product fractions and drying under vacuum

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

Procedure: To a solution of 3-chlorophthalic anhydride (3.7 g, 20 mmol) ((J. Org. Chem., 1987, 52, 129-134) in 60 mL of anhydrous 1,2-dichloroethane was added 6.6 g (50 mmol) of AlCl3 followed by 4.6 g (20 mmol) of methyl 3-(3-chloro-2,4-dihydroxyphenyl)propanoate (WO 03/023357). The reaction was heated at reflux for 30 min, cooled and concentrated. The resultant gelatinous material was partitioned between cold 2 N HCl (100 mL) and ethyl acetate (100 mL). The organic layer was washed with 1 N HCl, brine, dried over Na2SO4 and concentrated to afford an oily material (mixture of 6- and 2-chloroisomers). The oil was dissolved in dichloromethane (˜40 mL) and briefly sonicated (ultrasound bath) to initiate crystallization. The mixture was cooled (ice/water bath) and allowed to crystallize for 30 min (extended crystallization time will result in co-crystallization of undesired 2-chloro isomer). The crystals were collected by filtration washed with cold dichloromethane. Drying under vacuum afforded 4.01 g of desired 6-chloro isomer 32. 1H NMR (DMSO-d6) δ 12.47 (br s, 1H), 10.78 (br s, 1H), 8.06 (d, J=7.7 Hz, 1H), 7.89 (d, J=7.9 Hz, 1H), 7.71 (t, J=7.9 Hz, 1H), 6.76 (s, 1H), 3.46 (s, 3H), 2.27 (m, 2H), 2.41 (t, J=6.6 Hz, 2H). The reaction was heated at reflux for 30 min cooled concentrated The resultant gelatinous material was partitioned between cold 2 N HCl (100 mL) and ethyl acetate (100 mL) The organic layer was washed with 1 N HCl, brine dried over Na2SO4 concentrated to afford an oily material (mixture of 6- and 2-chloroisomers) briefly sonicated (ultrasound bath) crystallization The mixture was cooled (ice/water bath) to crystallize for 30 min (extended crystallization time will result in co-crystallization of undesired 2-chloro isomer) The crystals were collected by filtration washed with cold dichloromethane Drying under vacuum afforded 4.01 g of desired 6-chloro isomer 32

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

Procedure: Diketene (0.7 ml, 9.1 mmol) was added dropwise to a stirred solution of 5a (1.0 g, 4.3 mmol) in 7 ml of methanesulfonic acid. The resultant solution was heated at 70° C. for 5 min and cooled. Methanol (20 ml) was added and the reaction was heated to boiling; this treatment esterified small amount of free acid formed during the cyclization step. Methanol was evaporated and water was added to precipitate the product. The crude material was chromatographed on silica eluting with ethyl acetate. Concentration of the pure product fractions and drying under vacuum afforded 0.82 g (64%) of the desired product as a pale yellow solid. 1H NMR (DMSO-d6): δ 10.45 (s, 1H), 7.50 (s, 1H), 6.24 (s, 1H), 3.59 (s, 3H), 2.93 (t, J=7.5 Hz, 2H), 2.62 (t, J=7.5 Hz, 2H), 2.38 (s, 3H). cooled the reaction was heated to boiling formed during the cyclization step Methanol was evaporated water was added to precipitate the product The crude material was chromatographed on silica eluting with ethyl acetate Concentration of the pure product fractions and drying under vacuum

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

Procedure: To a solution of 3-chlorophthalic anhydride (3.7 g, 20 mmol) ((J. Org. Chem. 1987, 52, 129-134) in 60 mL of anhydrous 1,2-dichloroethane was added 6.6 g (50 mmol) of AlCl3 followed by 4.6 g (20 mmol) of methyl 3-(3-chloro-2,4-dihydroxyphenyl)propanoate (WO 03/023357). The reaction was heated at reflux for 30 min, cooled and concentrated. The resultant gelatinous material was partitioned between cold 2 N HCl (100 mL) and ethyl acetate (100 mL). The organic layer was washed with 1 N HCl, brine, dried over Na2SO4 and concentrated to afford an oily material (mixture of 6-and 2-chloroisomers). The oil was dissolved in dichloromethane (˜40 mL) and briefly sonicated (ultrasound bath) to initiate crystallization. The mixture was cooled (ice/water bath) and allowed to crystallize for 30 min (extended crystallization time will result in co-crystallization of undesired 2-chloro isomer). The crystals were collected by filtration washed with cold dichloromethane. Drying under vacuum afforded 4.01 g of desired 6-chloro isomer (32). 1H NMR (DMSO-d6) δ 12.47 (br s, 1H), 10.78 (br s, 1H), 8.06 (d, J=7.7 Hz, 1H), 7.89 (d, J=7.9 Hz, 1H), 7.71 (t, J=7.9 Hz, 1H), 6.76 (b, 1H), 3.46 (s, 3H), 2.27 (m, 2H), 2.41 (J, J=6.6 Hz, 2H). The reaction was heated at reflux for 30 min cooled concentrated The resultant gelatinous material was partitioned between cold 2 N HCl (100 mL) and ethyl acetate (100 mL) The organic layer was washed with 1 N HCl, brine dried over Na2SO4 concentrated to afford an oily material (mixture of 6-and 2-chloroisomers) briefly sonicated (ultrasound bath) crystallization The mixture was cooled (ice/water bath) to crystallize for 30 min (extended crystallization time will result in co-crystallization of undesired 2-chloro isomer) The crystals were collected by filtration washed with cold dichloromethane Drying under vacuum

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

Procedure: To a solution of 3-chlorophthalic anhydride (3.7 g, 20 mmol) ((J. Org. Chem., 1987, 52, 129-134) in 60 mL of anhydrous 1,2-dichloroethane was added 6.6 g (50 mmol) of AlCl3 followed by 4.6 g (20 mmol) of methyl 3-(3-chloro-2,4-dihydroxyphenyl)propanoate (WO 03/023357). The reaction was heated at reflux for 30 min, cooled and concentrated. The resultant gelatinous material was partitioned between cold 2 N HCl (100 mL) and ethyl acetate (100 mL). The organic layer was washed with 1 N HCl, brine, dried over Na2SO4 and concentrated to afford an oily material (mixture of 6- and 2-chloroisomers). The oil was dissolved in dichloromethane (˜40 mL) and briefly sonicated (ultrasound bath) to initiate crystallization. The mixture was cooled (ice/water bath) and allowed to crystallize for 30 min (extended crystallization time will result in co-crystallization of undesired 2-chloro isomer). The crystals were collected by filtration washed with cold dichloromethane. Drying under vacuum afforded 4.01 g of desired 6-chloro isomer 32. 1H NMR (DMSO-d6) δ 12.47 (br s, 1H), 10.78 (br s, 1H), 8.06 (d, J=7.7 Hz, 1H), 7.89 (d, J=7.9 Hz, 1H), 7.71 (t, J=7.9 Hz, 1H), 6.76 (s, 1H), 3.46 (s, 3H), 2.27 (m, 2H), 2.41 (t, J=6.6 Hz, 2H). The reaction was heated at reflux for 30 min cooled concentrated The resultant gelatinous material was partitioned between cold 2 N HCl (100 mL) and ethyl acetate (100 mL) The organic layer was washed with 1 N HCl, brine dried over Na2SO4 concentrated to afford an oily material (mixture of 6- and 2-chloroisomers) briefly sonicated (ultrasound bath) crystallization The mixture was cooled (ice/water bath) to crystallize for 30 min (extended crystallization time will result in co-crystallization of undesired 2-chloro isomer) The crystals were collected by filtration washed with cold dichloromethane Drying under vacuum afforded 4.01 g of desired 6-chloro isomer 32

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

Procedure: To a solution of 3-chlorophthalic anhydride (3.7 g, 20 mmol) ((J. Org. Chem., 1987, 52, 129-134) in 60 mL of anhydrous 1,2-dichloroethane was added 6.6 g (50 mmol) of AlCl3 followed by 4.6 g (20 mmol) of methyl 3-(3-chloro-2,4-dihydroxyphenyl)propanoate (WO 03/023357). The reaction was heated at reflux for 30 min, cooled and concentrated. The resultant gelatinous material was partitioned between cold 2 N HCl (100 mL) and ethyl acetate (100 mL). The organic layer was washed with 1 N HCl, brine, dried over Na2SO4 and concentrated to afford an oily material (mixture of 6- and 2-chloroisomers). The oil was dissolved in dichloromethane (˜40 mL) and briefly sonicated (ultrasound bath) to initiate crystallization. The mixture was cooled (ice/water bath) and allowed to crystallize for 30 min (extended crystallization time will result in co-crystallization of undesired 2-chloro isomer). The crystals were collected by filtration washed with cold dichloromethane. Drying under vacuum afforded 4.01 g of desired 6-chloro isomer (32). 1H NMR (DMSO-d6) δ 12.47 (br s, 1H), 10.78 (br s, 1H), 8.06 (d, J=7.7 Hz, 1H), 7.89 (d, J=7.9 Hz, 1H), 7.71 (t, J=7.9 Hz, 1H), 6.76 (s, 1H), 3.46 (s, 3H), 2.27 (m, 2H), 2.41 (t, J=6.6 Hz, 2H). The reaction was heated at reflux for 30 min cooled concentrated The resultant gelatinous material was partitioned between cold 2 N HCl (100 mL) and ethyl acetate (100 mL) The organic layer was washed with 1 N HCl, brine dried over Na2SO4 concentrated to afford an oily material (mixture of 6- and 2-chloroisomers) briefly sonicated (ultrasound bath) crystallization The mixture was cooled (ice/water bath) to crystallize for 30 min (extended crystallization time will result in co-crystallization of undesired 2-chloro isomer) The crystals were collected by filtration washed with cold dichloromethane Drying under vacuum

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

Procedure: To a solution of 3-chlorophthalic anhydride (3.7 g, 20 mmol) ((J. Org. Chem., 1987, 52, 129-134) in 60 mL of anhydrous 1,2-dichloroethane was added 6.6 g (50 mmol) of AlCl3 followed by 4.6 g (20 mmol) of methyl 3-(3-chloro-2,4-dihydroxyphenyl)propanoate (WO 03/023357). The reaction was heated at reflux for 30 min, cooled and concentrated. The resultant gelatinous material was partitioned between cold 2 N HCl (100 mL) and ethyl acetate (100 mL). The organic layer was washed with 1 N HCl, brine, dried over Na2SO4 and concentrated to afford an oily material (mixture of 6- and 2-chloroisomers). The oil was dissolved in dichloromethane (˜40 mL) and briefly sonicated (ultrasound bath) to initiate crystallization. The mixture was cooled (ice/water bath) and allowed to crystallize for 30 min (extended crystallization time will result in co-crystallization of undesired 2-chloro isomer). The crystals were collected by filtration washed with cold dichloromethane. Drying under vacuum afforded 4.01 g of desired 6-chloro isomer (32). 1H NMR (DMSO-d6) δ 12.47 (br s, 1H), 10.78 (br s, 1H), 8.06 (d, J=7.7 Hz, 1H), 7.89 (d, J=7.9 Hz, 1H), 7.71 (t, J=7.9 Hz, 1H), 6.76 (s, 1H), 3.46 (s, 3H), 2.27 (m, 2H), 2.41 (t, J=6.6 Hz, 2H). The reaction was heated at reflux for 30 min cooled concentrated The resultant gelatinous material was partitioned between cold 2 N HCl (100 mL) and ethyl acetate (100 mL) The organic layer was washed with 1 N HCl, brine dried over Na2SO4 concentrated to afford an oily material (mixture of 6- and 2-chloroisomers) briefly sonicated (ultrasound bath) crystallization The mixture was cooled (ice/water bath) to crystallize for 30 min (extended crystallization time will result in co-crystallization of undesired 2-chloro isomer) The crystals were collected by filtration washed with cold dichloromethane Drying under vacuum

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

Procedure: Diketene (0.7 ml, 9.1 mmol) was added dropwise to a stirred solution of 5a (1.0 g, 4.3 mmol) in 7 ml of methanesulfonic acid. The resultant solution was heated at 70° C. for 5 min and cooled. Methanol (20 ml) was added and the reaction was heated to boiling; this treatment esterified small amount of free acid formed during the cyclization step. Methanol was evaporated and water was added to precipitate the product. The crude material was chromatographed on silica eluting with ethyl acetate. Concentration of the pure product fractions and drying under vacuum afforded 0.82 g (64%) of the desired product as a pale yellow solid. 1H NMR (DMSO-d6): δ 10.45 (s, 1H), 7.50 (s, 1H), 6.24 (s, 1H), 3.59 (s, 3H), 2.93 (t, J=7.5 Hz, 2H), 2.62 (t, J=7.5 Hz, 2H), 2.38 (s, 3H). cooled the reaction was heated to boiling formed during the cyclization step Methanol was evaporated water was added to precipitate the product The crude material was chromatographed on silica eluting with ethyl acetate Concentration of the pure product fractions and drying under vacuum

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

Procedure: Diketene (0.7 ml, 9.1 mmol) was added dropwise to a stirred solution of 5a (1.0 g, 4.3 mmol) in 7 ml of methanesulfonic acid. The resultant solution was heated at 70° C. for 5 min and cooled. Methanol (20 ml) was added and the reaction was heated to boiling; this treatment esterified small amount of free acid formed during the cyclization step. Methanol was evaporated and water was added to precipitate the product. The crude material was chromatographed on silica eluting with ethyl acetate. Concentration of the pure product fractions and drying under vacuum afforded 0.82 g (64%) of the desired product as a pale yellow solid. 1H NMR (DMSO-d6): δ 10.45 (s, 1H), 7.50 (s, 1H), 6.24 (s, 1H), 3.59 (s, 3H), 2.93 (t, J=7.5 Hz, 2H), 2.62 (t, J=7.5 Hz, 2H), 2.38 (s, 3H). cooled the reaction was heated to boiling formed during the cyclization step Methanol was evaporated water was added to precipitate the product The crude material was chromatographed on silica eluting with ethyl acetate Concentration of the pure product fractions and drying under vacuum

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

Procedure: To a solution of 3-chlorophthalic anhydride (3.7 g, 20 mmol) ((J. Org, Chem., 1987, 52, 129-134) in 60 mL of anhydrous 1,2-dichloroethane was added 6.6 g (50 mmol) of AlCl3 followed by 4.6 g (20 mmol) of methyl 3-(3-chloro-2,4-dihydroxyphenyl)propanoate (WO 03/023357). The reaction was heated at reflux for 30 min, cooled and concentrated, The resultant gelatinous material was partitioned between cold 2 N HCl (100 mL) and ethyl acetate (100 mL). The organic layer was washed with 1 N HCl, brine, dried over Na2SO4 and concentrated to afford an oily material (mixture of 6- and 2-chloroisomers). The oil was dissolved in dichloromethane (˜40 mL) and briefly sonicated (ultrasound bath) to initiate crystallization. The mixture was cooled (ice/water bath) and allowed to crystallize for 30 min (extended crystallization time will result in co-crystallization of undesired 2-chloro isomer). The crystals were collected by filtration washed with cold dichloromethane. Drying under vacuum afforded 4.01 g of desired 6-chloro isomer (32). 1H NMR (DMSO-d6) δ 12.47 (br s, 1H), 10.78 (br s, 1H), 8.06 (d, J=7.7 Hz, 1H), 7.89 (d, J=7.9 Hz, 1H), 7.71 (t, J=7.9 Hz, 1H), 6.76 (s, 1H), 3.46 (s, 3H), 2.27 (m, 2H), 2.41 (t, J=6.6 Hz, 2H). The reaction was heated at reflux for 30 min cooled concentrated The resultant gelatinous material was partitioned between cold 2 N HCl (100 mL) and ethyl acetate (100 mL) The organic layer was washed with 1 N HCl, brine dried over Na2SO4 concentrated to afford an oily material (mixture of 6- and 2-chloroisomers) briefly sonicated (ultrasound bath) crystallization The mixture was cooled (ice/water bath) to crystallize for 30 min (extended crystallization time will result in co-crystallization of undesired 2-chloro isomer) The crystals were collected by filtration washed with cold dichloromethane Drying under vacuum

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

Procedure: Diketene (0.7 ml, 9.1 mmol) was added dropwise to a stirred solution of 5a (1.0 g, 4.3 mmol) in 7 ml of methanesulfonic acid. The resultant solution was heated at 70° C. for 5 min and cooled. Methanol (20 ml) was added and the reaction was heated to boiling; this treatment esterified small amount of free acid formed during the cyclization step. Methanol was evaporated and water was added to precipitate the product. The crude material was chromatographed on silica eluting with ethyl acetate. Concentration of the pure product fractions and drying under vacuum afforded 0.82 g (64%) of the desired product as a pale yellow solid. 1H NMR (DMSO-d6): δ 10.45 (s, 1H), 7.50 (s, 1H), 6.24 (s, 1H), 3.59 (s, 3H), 2.93 (t, J=7.5 Hz, 2H), 2.62 (t, J=7.5 Hz, 2H), 2.38 (s, 3H). cooled the reaction was heated to boiling formed during the cyclization step Methanol was evaporated water was added to precipitate the product The crude material was chromatographed on silica eluting with ethyl acetate Concentration of the pure product fractions and drying under vacuum

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

Procedure: Diketene (0.7 ml, 9.1 mmol) was added dropwise to a stirred solution of 5a (1.0 g, 4.3 mmol) in 7 ml of methanesulfonic acid. The resultant solution was heated at 70° C. for 5 min and cooled. Methanol (20 ml) was added and the reaction was heated to boiling; this treatment esterified small amount of free acid formed during the cyclization step. Methanol was evaporated and water was added to precipitate the product. The crude material was chromatographed on silica eluting with ethyl acetate. Concentration of the pure product fractions and drying under vacuum afforded 0.82 g (64%) of the desired product as a pale yellow solid. 1H NMR (DMSO-d6): δ 10.45 (s, 1H), 7.50 (s, 1H), 6.24 (s, 1H), 3.59 (s, 2.93 (t, J=7.5 Hz, 2H), 2.62 (t, J=7.5 Hz, 2H), 2.38 (s, 3H). cooled the reaction was heated to boiling formed during the cyclization step Methanol was evaporated water was added to precipitate the product The crude material was chromatographed on silica eluting with ethyl acetate Concentration of the pure product fractions and drying under vacuum