达格列净杂质90

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of 2-ethylphenol (6.9 g, 56.5 mmol), triphenylphosphine (15.7 g, 60 mmol) and ethanol (6 mL, excess) in tetrahydrofuran (100 mL) was added dropwise DIAD (12.1 g, 60 mmol). After stirring for 18 hours, mixture was evaporated and the residue was chromatographed on silica gel (heptane/ethyl acetate 9/1) to give 1-ethoxy-2-ethyl benzene (7.2 g) as a clear liquid. GC-MS shows one peak, RT=5.6 minutes. MS 150 (M+). mixture was evaporated the residue was chromatographed on silica gel (heptane/ethyl acetate 9/1)

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 1-ethoxy-2-ethyl benzene (3.5 g, Reference Example 51) in acetic anhydride (30 mL) was chilled in an ice-water bath. A solution of nitric acid (1.4 mL of 90%-30% excess) in acetic acid (25 mL) was added dropwise and the mixture was stirred overnight at ambient temperature. The reaction mixture was poured into ice water (300 mL) and the aqueous mixture was extracted with ethyl acetate (2×200 mL). The combined extracts were evaporated and the residue was chromatographed on silica gel (heptane with gradient of 5 to 10% ethyl acetate) to give 1-ethoxy-2-ethyl-4-nitrobenzene (1.4 g) as a clear liquid. LC-MS (Method E) RT=3.75 minutes, 196 (M+H)+. (i) N-(5-Chloro-4-methoxy-2-nitrophenyl)acetamide the aqueous mixture was extracted with ethyl acetate (2×200 mL) The combined extracts were evaporated the residue was chromatographed on silica gel (heptane with gradient of 5 to 10% ethyl acetate)

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of 2-ethylphenol (6.9 g, 56.5 mmol), triphenylphosphine (15.7 g, 60 mmol) and ethanol (6 mL, excess) in tetrahydrofuran (100 mL) was added dropwise DIAD (12.1 g, 60 mmol). After stirring for 18 hours, mixture was evaporated and the residue was chromatographed on silica gel (heptane/ethyl acetate 9/1) to give 1-ethoxy-2-ethyl benzene (7.2 g) as a clear liquid. GC-MS shows one peak, RT=5.6 minutes. MS 150 (M+). mixture was evaporated the residue was chromatographed on silica gel (heptane/ethyl acetate 9/1)

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 1-ethoxy-2-ethyl benzene (3.5 g, Reference Example 51) in acetic anhydride (30 mL) was chilled in an ice-water bath. A solution of nitric acid (1.4 mL of 90%-30% excess) in acetic acid (25 mL) was added dropwise and the mixture was stirred overnight at ambient temperature. The reaction mixture was poured into ice water (300 mL) and the aqueous mixture was extracted with ethyl acetate (2×200 mL). The combined extracts were evaporated and the residue was chromatographed on silica gel (heptane with gradient of 5 to 10% ethyl acetate) to give 1-ethoxy-2-ethyl-4-nitrobenzene (1.4 g) as a clear liquid. LC-MS (Method E) RT=3.75 minutes, 196 (M+H)+. the aqueous mixture was extracted with ethyl acetate (2×200 mL) The combined extracts were evaporated the residue was chromatographed on silica gel (heptane with gradient of 5 to 10% ethyl acetate)