Methyl-7-hydroxyhept-5-ynoate

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 solution of 30 (1.347 g, 8.6 mmol) in 5 mL dichloromethane was added to a mixture of triphenylphosphine (2.725 g, 10.4 mmol), imidazole (726 mg, 10.7 mmol), and iodine (2.602 g, 10.3 mmol) in 34 mL dichloromethane, rinsing with 5 mL dichloromethane. After 40 min., the dichloromethane was evaporated in vacuo to a few mL's and the resulting mixture filtered through basic alumina, washing with 10% ethyl acetate/hexanes. Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes) gave 1.878 g (7.1 mmol, 83%) of the propargyl iodide. rinsing with 5 mL dichloromethane the dichloromethane was evaporated in vacuo to a few mL's the resulting mixture filtered through basic alumina washing with 10% ethyl acetate/hexanes Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes)

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

实验步骤: The crude acid 29 (6.333 g) was treated with a 1% solution of acetyl chloride in methanol (60 mL). After 16 h, sodium bicarbonate (1.966 g, 23.4 mmol) was added. The mixture was dried (MgSO4), filtered through celite and evaporated in vacuo. Purification by flash chromatography on silica gel (30-40% ethyl acetate/hexanes) gave 7-Hydroxy-hept-5-ynoic acid methyl ester 30 (3.022 g, 19.3 mmol, 92% from 7-(tert-Butyl-dimethyl-silanyloxy)-hept-2-yn-1-ol 27). The mixture was dried (MgSO4) filtered through celite evaporated in vacuo Purification by flash chromatography on silica gel (30-40% ethyl acetate/hexanes)

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

实验步骤: A solution of (30) (1.347 g, 8.6 mmol) in 5 mL dichloromethane was added to a mixture of triphenylphosphine (2.725 g, 10.4 mmol), imidazole (726 mg, 10.7 mmol), and iodine (2.602 g, 10.3 mmol) in 34 mL dichloromethane, rinsing with 5 mL dichloromethane. After 40 minutes, the dichloromethane was evaporated in vacuo to about 2 mL and the resulting mixture filtered through basic alumina, washing with 10% ethyl acetate/hexanes. Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes) gave 1.878 g (7.1 mmol, 83%) of the propargyl iodide. rinsing with 5 mL dichloromethane the dichloromethane was evaporated in vacuo to about 2 mL the resulting mixture filtered through basic alumina washing with 10% ethyl acetate/hexanes Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes)

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

实验步骤: A solution of (30) (1.347 g, 8.6 mmol) in 5 mL dichloromethane was added to a mixture of triphenylphosphine (2.725 g, 10.4 mmol), imidazole (726 mg, 10.7 mmol), and iodine (2.602 g, 10.3 mmol) in 34 mL dichloromethane, rinsing with 5 mL dichloromethane. After 40 minutes, the dichloromethane was evaporated in vacuo to about 2 mL and the resulting mixture filtered through basic alumina, washing with 10% ethyl acetate/hexanes. Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes) gave 1.878 g (7.1 mmol, 83%) of the propargyl iodide. rinsing with 5 mL dichloromethane the dichloromethane was evaporated in vacuo to about 2 mL the resulting mixture filtered through basic alumina washing with 10% ethyl acetate/hexanes Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes)

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

实验步骤: A solution of (30) (1.347 g, 8.6 mmol) in 5 mL dichloromethane was added to a mixture of triphenylphosphine (2.725 g, 10.4 mmol), imidazole (726 mg, 10.7 mmol), and iodine (2.602 g, 10.3 mmol) in 34 mL dichloromethane, rinsing with 5 mL dichloromethane. After 40 minutes, the dichloromethane was evaporated in vacuo to about 2 mL and the resulting mixture filtered through basic alumina, washing with 10% ethyl acetate/hexanes. Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes) gave 1.878 g (7.1 mmol, 83%) of the propargyl iodide. rinsing with 5 mL dichloromethane the dichloromethane was evaporated in vacuo to about 2 mL the resulting mixture filtered through basic alumina washing with 10% ethyl acetate/hexanes Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes)

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

实验步骤: A solution of (30) (1.347 g, 8.6 mmol) in 5 mL dichloromethane was added to a mixture of triphenylphosphine (2.725 g, 10.4 mmol), imidazole (726 mg, 10.7 mmol), and iodine (2.602 g, 10.3 mmol) in 34 mL dichloromethane, rinsing with 5 mL dichloromethane. After 40 minutes, the dichloromethane was evaporated in vacuo to about 2 mL and the resulting mixture filtered through basic alumina, washing with 10% ethyl acetate/hexanes. Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes) gave 1.878 g (7.1 mmol, 83%) of the propargyl iodide. rinsing with 5 mL dichloromethane the dichloromethane was evaporated in vacuo to about 2 mL the resulting mixture filtered through basic alumina washing with 10% ethyl acetate/hexanes Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes)

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 solution of 30 (1.347 g, 8.6 mmol) in 5 mL dichloromethane was added to a mixture of triphenylphosphine (2.725 g, 10.4 mmol), imidazole (726 mg, 10.7 mmol), and iodine (2.602 g, 10.3 mmol) in 34 mL dichloromethane, rinsing with 5 mL dichloromethane. After 40 min., the dichloromethane was evaporated in vacuo to a few mL's and the resulting mixture filtered through basic alumina, washing with 10% ethyl acetate/hexanes. Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes) gave 1.878 g (7.1 mmol, 83%) of the propargyl iodide. rinsing with 5 mL dichloromethane the dichloromethane was evaporated in vacuo to a few mL's the resulting mixture filtered through basic alumina washing with 10% ethyl acetate/hexanes Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes)

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

实验步骤: The crude acid 29 (6.333 g) was treated with a 1% solution of acetyl chloride in methanol (60 mL). After 16 h, sodium bicarbonate (1.966 g, 23.4 mmol) was added. The mixture was dried (MgSO4), filtered through celite and evaporated in vacuo. Purification by flash chromatography on silica gel (30-40% ethyl acetate/hexanes) gave 7-Hydroxy-hept-5-ynoic acid methyl ester 30 (3.022 g, 19.3 mmol, 92% from 7-(tert-Butyl-dimethyl-silanyloxy)-hept-2-yn-1-ol 27). The mixture was dried (MgSO4) filtered through celite evaporated in vacuo Purification by flash chromatography on silica gel (30-40% ethyl acetate/hexanes)

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

实验步骤: The crude acid 29 (6.333 g) was treated with a 1% solution of acetyl chloride in methanol (60 mL). After 16 h, sodium bicarbonate (1.966 g, 23.4 mmol) was added. The mixture was dried (MgSO4), filtered through celite and evaporated in vacuo. Purification by flash chromatography on silica gel (30-40% ethyl acetate/hexanes) gave 7-Hydroxy-hept-5-ynoic acid methyl ester 30 (3.022 g, 19.3 mmol, 92% from 7-(tert-Butyl-dimethyl-silanyloxy)-hept-2-yn-1-ol 27). The mixture was dried (MgSO4) filtered through celite evaporated in vacuo Purification by flash chromatography on silica gel (30-40% ethyl acetate/hexanes)

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

实验步骤: A solution of (30) (1.347 g, 8.6 mmol) in 5 mL dichloromethane was added to a mixture of triphenylphosphine (2.725 g, 10.4 mmol), imidazole (726 mg, 10.7 mmol), and iodine (2.602 g, 10.3 mmol) in 34 mL dichloromethane, rinsing with 5 mL dichloromethane. After 40 minutes, the dichloromethane was evaporated in vacuo to about 2 mL and the resulting mixture filtered through basic alumina, washing with 10% ethyl acetate/hexanes. Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes) gave 1.878 g (7.1 mmol, 83%) of the propargyl iodide. rinsing with 5 mL dichloromethane the dichloromethane was evaporated in vacuo to about 2 mL the resulting mixture filtered through basic alumina washing with 10% ethyl acetate/hexanes Purification by flash chromatography on silica gel (10% ethyl acetate/hexanes)