2-[2-[2-[2-[(tert-Butyldimethylsilanyl)oxy]ethoxy]ethoxy]ethoxy]ethanol

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

Procedure: Compound 5c (680 mg, 2.20 mmol) and carbon tetrabromide (947 mg, 2.86 mg) were dissolved in dichloromethane (20 ml). The solution was cooled down to 0° C. with an ice bath and pyridine (2.0 ml) was added followed by triphenylphosphine (749 mg, 0.286 mmol). The solution was stirred at 0° C. for half an hour and at room temperature for 2 hours. After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (20% ethyl acetate in hexane) to afford compound 6c (680 mg, 79.6%): 1H NMR δ 3.79 (m, 4H), 3.66 (m, 8H), 3.56 (t, 2H), 3.47 (t, 2H), 0.89 (s, 9H), 0.07 (s, 6H). After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (20% ethyl acetate in hexane)

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

Procedure: Compound 5c (680 mg, 2.20 mmol) and carbon tetrabromide (947 mg, 2.86 mg) were dissolved in dichloromethane (20 ml). The solution was cooled down to 0° C. with an ice bath and pyridine (2.0 ml) was added followed by triphenylphosphine (749 mg, 0.286 mmol). The solution was stirred at 0° C. for half an hour and at room temperature for 2 hours. After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (20% ethyl acetate in hexane) to afford compound 6c (680 mg, 79.6%): 1H NMR δ 3.79 (m, 4H), 3.66 (m, 8H), 3.56 (t, 2H), 3.47 (t, 2H), 0.89 (s, 9H), 0.07 (s, 6H). After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (20% ethyl acetate in hexane)

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

Procedure: Compound 5c (680 mg, 2.20 mmol) and carbon tetrabromide (947 mg, 2.86 mg) were dissolved in dichloromethane (20 ml). The solution was cooled down to 0° C. with an ice bath and pyridine (2.0 ml) was added followed by triphenylphosphine (749 mg, 0.286 mmol). The solution was stirred at 0° C. for half an hour and at room temperature for 2 hours. After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (20% ethyl acetate in hexane) to afford compound 6c (680 mg, 79.6%): 1H NMR δ 3.79 (m, 4H), 3.66 (m, 8H), 3.56 (t, 2H), 3.47 (t, 2H), 0.89 (s, 9H), 0.07 (s, 6H). After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (20% ethyl acetate in hexane)

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

Procedure: Tetraethylene glycol, 4c (1.12 g, 5.77 mmol) and TBDMSCl (0.87 g, 5.77 mmol) were dissolved in dichloromethane (25 ml) followed by triethyl amine (1.46 g, 14.4 mmol). The solution was stirred at room temperature for 2 hours. After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (50% ethyl acetate in hexane) to afford 5c (744 mg, 42%): 1H NMR δ 3.66 (m, 16H), 2.51 (t, 1H, J=5.86 Hz), 0.89 (s, 9H), 0.07 (s, 6H). After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (50% ethyl acetate in hexane)

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

Procedure: Tetraethylene glycol, 4c (1.12 g, 5.77 mmol) and TBDMSCl (0.87 g, 5.77 mmol) were dissolved in dichloromethane (25 ml) followed by triethyl amine (1.46 g, 14.4 mmol). The solution was stirred at room temperature for 2 hours. After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (50% ethyl acetate in hexane) to afford 5c (744 mg, 42%): 1H NMR δ 3.66 (m, 16H), 2.51 (t, 1H, J=5.86 Hz), 0.89 (s, 9H), 0.07 (s, 6H). After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (50% ethyl acetate in hexane)

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

Procedure: Compound 5c (680 mg, 2.20 mmol) and carbon tetrabromide (947 mg, 2.86 mg) were dissolved in dichloromethane (20 ml). The solution was cooled down to 0° C. with an ice bath and pyridine (2.0 ml) was added followed by triphenylphosphine (749 mg, 0.286 mmol). The solution was stirred at 0° C. for half an hour and at room temperature for 2 hours. After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (20% ethyl acetate in hexane) to afford compound 6c (680 mg, 79.6%): 1H NMR δ 3.79 (m, 4H), 3.66 (m, 8H), 3.56 (t, 2H), 3.47 (t, 2H), 0.89 (s, 9H), 0.07 (s, 6H). After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (20% ethyl acetate in hexane)

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

Procedure: Tetraethylene glycol, 4c (1.12 g, 5.77 mmol) and TBDMSCl (0.87 g, 5.77 mmol) were dissolved in dichloromethane (25 ml) followed by triethyl amine (1.46 g, 14.4 mmol). The solution was stirred at room temperature for 2 hours. After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (50% ethyl acetate in hexane) to afford 5c (744 mg, 42%): 1H NMR δ 3.66 (m, 16H), 2.51 (t, 1H, J=5.86 Hz), 0.89 (s, 9H), 0.07 (s, 6H). After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (50% ethyl acetate in hexane)

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

Procedure: Compound 28b was prepared according to the procedure described hereinabove for Compound 28a, using tetraethylene glycol (6 grams, 30 mmol), TBDMSCl (3 grams, 20 mmol), and imidazole (1.4 grams, 20 mmol) in DMF (24 ml), yielding 3.79 grams of the product (41% yield).

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

Procedure: Compound 5c (680 mg, 2.20 mmol) and carbon tetrabromide (947 mg, 2.86 mg) were dissolved in dichloromethane (20 ml). The solution was cooled down to 0° C. with an ice bath and pyridine (2.0 ml) was added followed by triphenylphosphine (749 mg, 0.286 mmol). The solution was stirred at 0° C. for half an hour and at room temperature for 2 hours. After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (20% ethyl acetate in hexane) to afford compound 6c (680 mg, 79.6%): 1H NMR δ 3.79 (m, 4H), 3.66 (m, 8H), 3.56 (t, 2H), 3.47 (t, 2H), 0.89 (s, 9H), 0.07 (s, 6H). After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (20% ethyl acetate in hexane)

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

Procedure: Tetraethylene glycol, 4c (1.12 g, 5.77 mmol) and TBDMSCl (0.87 g, 5.77 mmol) were dissolved in dichloromethane (25 ml) followed by triethyl amine (1.46 g, 14.4 mmol). The solution was stirred at room temperature for 2 hours. After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (50% ethyl acetate in hexane) to afford 5c (744 mg, 42%): 1H NMR δ 3.66 (m, 16H), 2.51 (t, 1H, J=5.86 Hz), 0.89 (s, 9H), 0.07 (s, 6H). After standard workup with dichloromethane, the residue was purified by silica gel column chromatography (50% ethyl acetate in hexane)