3-acetyloxy-2,2-dimethylpropanoic acid

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:

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: A benzene solution (25 ml) of crude 3-acetoxy-2,2-dimethyl proprionic acid from Example 3(a) (7.4 g, 46.5 mmol), oxalyl chloride (6.45 g, 51 ml) and DMF (2 drops) was stirred at ambient temperature for 3 hours. The pale yellow solution was distilled to provide the title compound as a colorless liquid, b.p.15 85°-88° C. NMR (CDCl3) δ 4.18 (2 H, s), 2.08 (3 H, s), 1.35 (6 H, s). The pale yellow solution was distilled

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

实验步骤: Acetyl chloride (4.52, 58.2 mmol) was added dropwise to a cold (0° C.) pyridine solution (10 ml) of 2,2-dimethyl-3-hydroxypropionic acid (5.5 g, 46.5 mmol) and 4-DMAP (0.57 g, 4.65 mmol). After stirring overnight at ambient temperature, the reaction was poured into ether (200 ml). This mixture was washed with 10% HCl (2×20 ml), and saturated brine (2×25 ml) and the resulting ethereal solution was dried (MgSO4). Evaporation gave the title compound as a pale yellow solid which was used in the next step without further purification. NMR (CDCl3) δ 4.13 (2 H, s), 2.08 (3 H, s), 1.26 (6 H, s). This mixture was washed with 10% HCl (2×20 ml), and saturated brine (2×25 ml) the resulting ethereal solution was dried (MgSO4) Evaporation

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

实验步骤: A benzene solution (25 ml) of crude 3-acetoxy-2,2-dimethyl propionic acid from Example 3(a) (7.4 g, 46.5 mmol), oxalyl chloride (6.45 g, 51 ml) and DMF (2 drops) was stirred at ambient temperature for 3 hours. The pale yellow solution was distilled to provide the title compound as a colorless liquid, b.p.15 85°-88° C. NMR (CDCl3) δ4.18 (2H, s), 2.08 (3H, s), 1.35 (6H, s). The pale yellow solution was distilled

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

实验步骤: A benzene solution (25 ml) of crude 3-acetoxy-2,2-dimethyl propionic acid from Example 3(a) (7.4 g, 46.5 mmol), oxalyl chloride (6.45 g, 51 ml) and DMF (2 drops) was stirred at ambient temperature for 3 hours. The pale yellow solution was distilled to provide the title compound as a colorless liquid, b.p.15 85°-88° C. NMR (CDCl3) δ4.18 (2H, s), 2.08 (3H, s), 1.35 (6H, s). The pale yellow solution was distilled

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

实验步骤: Acetyl chloride (4.52, 58.2 mmol) was added dropwise to a cold (0° C.) pyridine solution (10 ml) of 2,2-dimethyl-3-hydroxypropionic acid (5.5 g, 46.5 mmol) and 4-DMAP (0.57 g, 4.65 mmol). After stirring overnight at ambient temperature, the reaction was poured into ether (200 ml). This mixture was washed with 10% HCl (2×20 ml), and saturated brine (2×25 ml) and the resulting ethereal solution was dried (MgSO4). Evaporation gave the title compound as a pale yellow solid which was used in the next step without further purification. NMR (CDCl3) δ4.13 (2H, s), 2.08 (3H, s), 1.26 (6H, s). This mixture was washed with 10% HCl (2×20 ml), and saturated brine (2×25 ml) the resulting ethereal solution was dried (MgSO4) Evaporation

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

实验步骤: A benzene solution (25 ml) of crude 3-acetoxy-2,2-dimethyl propionic acid from Example 3(a) (7.4 g, 46.5 mmol), oxalyl chloride (6.45 g, 51 ml) and DMF (2 drops) was stirred at ambient temperature for 3 hours. The pale yellow solution was distilled to provide the title compound as a colorless liquid, b.p.15 85°-88° C. NMR (CDCl3) δ4.18 (2H, s), 2.08 (3H, s), 1.35 (6H, s). The pale yellow solution was distilled

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

实验步骤: Acetyl chloride (4.52 g, 58.2 mmol) was added dropwise to a cold (0° C.) pyridine solution (10 ml) of 2,2-dimethyl-3-hydroxypropionic acid (5.5 g, 46.5 mmol) and 4-DMAP (0.57 g, 4.65 mmol). After stirring overnight at ambient temperature, the reaction was poured into ether (200 ml). This mixture was washed with 10% HCl (2×20 ml), and saturated brine (2×25 ml) and the resulting ethereal solution was dried (MgSO4). Evaporation gave the title compound as a pale yellow solid which was used in the next step without further purification. NMR (CDCl3) δ4.13 (2H, s), 2.08 (3H, s), 1.26 (6H, s). This mixture was washed with 10% HCl (2×20 ml), and saturated brine (2×25 ml) the resulting ethereal solution was dried (MgSO4) Evaporation

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: The product of Step A, 2,2-dimethyl-3-acetyloxypropionic acid (11.76 g, 80 mmol) was dissolved in benzene (100 mL), and the reaction solution was cooled to 0° C., and then oxalyl chloride (15.0 g, 120 mmol) was slowly added dropwise. After 3 hours, the solvent was removed in vacuo, and the reaction mixture was distilled in vacuo to give the title compound. the solvent was removed in vacuo the reaction mixture was distilled in vacuo