4-amino-5-chloro-2-methoxybenzaldehyde

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

Conditions: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 3-Chloropropionyl chloride (98.4 ml, 1.0 mol) was added over 30 minutes to a stirred suspension of 4-amino-5-chloro-2-methoxybenzaldehyde (47.4 g, 0.26 mol) ensuring the reaction temperature did not exceed 20° C. After the addition was complete the reaction was stirred at 20° C. for a further 2 hours and then filtered. The filtrate was concentrated to 150 ml under reduced pressure and then diluted with ethyl acetate (100 ml) and water (400 ml). The mixture was stirred at 20° C. for 1 hour and then filtered to give 3-chloro-N-[2-chloro-4-formyl-5-(methyloxy)phenyl]propanamide as an off-white solid which was not isolated but suspended in tetrahydrofuran (730 ml) and treated with diisopropylethylamine (154 ml, 0.88 mol). The resulting mixture was stirred at 45° C. for 46 hours and then concentrated under reduced pressure to leave a residue which was diluted with ethyl acetate (300 ml), washed with 2M hydrochloric acid (4×100 ml) and concentrated under reduced pressure to give N-[2-chloro-4-formyl-5-(methyloxy)phenyl]-2-propenamide (37.8 g, 62%). did not exceed 20° C After the addition filtered The filtrate was concentrated to 150 ml under reduced pressure diluted with ethyl acetate (100 ml) and water (400 ml) The mixture was stirred at 20° C. for 1 hour filtered

Conditions: temp:35.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Acrylic acid (commercially available, for example, from Aldrich) (46 ml, 0.67 mol) was added slowly to a stirred suspension of 4-amino-5-chloro-2-methoxybenzaldehyde (Step B) (50.0 g, 0.27 mol) and triethylamine (204 g, 2.02 mol) in ethyl acetate (0.85 L) at 25° C. Propanephosphonic anhydride (50% in ethyl acetate; 429 g, 0.67 mol) was added over 30 minutes keeping reaction temperature at 30-40° C. The mixture was stirred at 30-40° C. for a further 1 hour and then cooled to 25° C. and diluted with water (0.26 L) and acidified with 32% hydrochloric acid (108 g) to pH 2-3. The organic layer was separated and washed with a mixture of water (0.23 L) and 32% sodium hydroxide (14 g)—aqueous layer ca. pH 7. The organic phase was washed with water (0.23 L) and then concentrated under reduced pressure (ca. 300 mbar) to remove 0.56 kg of distillate. Methylcyclohexane (335 g) was added and then a further 286 g of distillate was removed under reduced pressure. Methylcyclohexane (111 g) was added and then the resulting suspension was cooled to 20° C., filtered and washed with methylcyclohexane. The cake was dried at 40° C. under reduced pressure for 12 hours to give N-[2-chloro-4-formyl-5-(methyloxy)phenyl]-2-propenamide (46 g, 71%) reaction temperature at 30-40° C cooled to 25° C. The organic layer was separated washed with a mixture of water (0.23 L) and 32% sodium hydroxide (14 g)—aqueous layer The organic phase was washed with water (0.23 L) concentrated under reduced pressure (ca. 300 mbar) to remove 0.56 kg of distillate Methylcyclohexane (335 g) was added a further 286 g of distillate was removed under reduced pressure Methylcyclohexane (111 g) was added the resulting suspension was cooled to 20° C. filtered washed with methylcyclohexane The cake was dried at 40° C. under reduced pressure for 12 hours

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Isopropylmagnesium chloride (2M in tetrahydrofuran, 23 ml, 46 mmol) (commercially available, for example, from Aldrich) was added over 5 minutes to a stirred solution of 4-bromo-2-chloro-5-methoxyaniline (Step A) (10 g, 42 mmol) in tetrahydrofuran (70 ml) at −10° C. The resulting solution was allowed to warm to 0° C. over 50 minutes to give a thick slurry, then cooled to −25° C. and n-butyllithium (1.6M in hexanes, 90 ml, 144 mmol) was added over 20 minutes followed by tetrahydrofuran (20 ml). The solution was warmed to −10° C. over 30 minutes and then N,N-dimethylformamide (16 ml, 207 mmol) was added over 5 minutes and the resulting thick slurry was warmed to 0° C. over 20 minutes. A solution of citric acid (22 g, 105 mmol) in water (50 ml) was added cautiously over 15 minutes keeping reaction at <10° C. The slurry was aged at 20° C. for 30 minutes then filtered under vacuum. The cake was washed with water (100 ml) and then dried under vacuum at 40° C. for 16 hours to give 4-amino-5-chloro-2-methoxybenzaldehyde (6.1 g, 80% th) as a pale yellow solid. to give a thick slurry cooled to −25° C. The solution was warmed to −10° C. over 30 minutes the resulting thick slurry was warmed to 0° C. over 20 minutes reaction at <10° C then filtered under vacuum The cake was washed with water (100 ml) dried under vacuum at 40° C. for 16 hours