Cyclobutanecarboxylic acid, 1-broMo-, Methyl ester

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

Conditions: temp:140.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 5-chloro-2-hydroxy-benzaldehyde (10 g, 64 mmol), KI (3 g) and K2CO3 (13 g, 94 mmol) in DMF (100 mL) was added 1-bromo-cyclobutanecarboxylic acid methyl ester (15 g, 77 mmol). The mixture was heated at 140° C. for 1.5 h. Then additional 1-bromo-cyclobutanecarboxylic acid methyl ester (0.5 g, 2.6 mmol) was added and the mixture was heated at 140° C. for additional 10 min, cooled to room temperature and partitioned between ethyl acetate and water. The organic layer was washed with water, dried over anhydrous Na2SO4, concentrated to give the title compound as dark oil (18 g). the mixture was heated at 140° C. for additional 10 min cooled to room temperature partitioned between ethyl acetate and water The organic layer was washed with water dried over anhydrous Na2SO4 concentrated

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

Conditions: temp:140.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 5-chloro-2-hydroxy-benzaldehyde (10 g, 64 mmol) and K2CO3 (13 g, 94 mmol) in DMF (100 mL) was added 1-bromo-cyclobutanecarboxylic acid methyl ester (15 g, 77 mmol, prepared according to Bulletin of the Chemical Society of Japan, 36, 145-7; 1963). The mixture was heated at 140° C. for 1.5 h. Then additional 1-Bromo-cyclobutanecarboxylic acid methyl ester (0.5 g, 2.6 mmol) was added and the mixture was heated at 140° C. for additional 10 min. The mixture was cooled to room temperature and poured into water (200 mL). The mixture was extracted with ethyl acetate twice. The organic layers were combined, washed with water (4×), dried over Na2SO4, concentrated to afford crude product 1-(4-chloro-2-formyl-phenoxy)-cyclobutanecarboxylic acid methyl ester as a dark oil (18 g). prepared the mixture was heated at 140° C. for additional 10 min The mixture was cooled to room temperature The mixture was extracted with ethyl acetate twice washed with water (4×) dried over Na2SO4 concentrated

Conditions: temp:140.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 5-chloro-2-hydroxy-benzaldehyde (10 g, 64 mmol), KI (3 g) and K2CO3 (13 g, 94 mmol) in DMF (100 mL) was added 1-bromo-cyclobutanecarboxylic acid methyl ester (15 g, 77 mmol). The mixture was heated at 140° C. for 1.5 h. Then additional 1-bromo-cyclobutanecarboxylic acid methyl ester (0.5 g, 2.6 mmol) was added and the mixture was heated at 140° C. for additional 10 min, cooled to room temperature and partitioned between ethyl acetate and water. The organic layer was washed with water, dried over anhydrous Na2SO4, concentrated to give the title compound as dark oil (18 g). the mixture was heated at 140° C. for additional 10 min cooled to room temperature partitioned between ethyl acetate and water The organic layer was washed with water dried over anhydrous Na2SO4 concentrated