2-bromoethoxy(trimethyl)silane

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

Procedure: A solution of 11.5 g (61 mmol) of biscyclopentadienyidimethylsilane in THF was added to a suspension of 1.3 g (55 mmol) of HK in THF at −78° C. A purple solution was immediately formed. Then, the volatiles were removed and the residue was washed with hexane to give a pink solid. The solid was solved again in THF and a solution of 10.8 g (55 mmol) of 2-bromo-1-trimethylsiloxyethane in THF was added at room temperature. A pink suspension was immediately formed. The mixture was stirred for 12 h, and then the solvents were removed, the residue was treated with hexane and the supernatant solution was filtered. The removal of the hexane led to a reddish oil. This oil was distilled in order to obtain a yellow oil, which was characterized as a mixture of position isomers of (2-trimethylsiloxyethylcyclopentadienyl) dimethyl cyclopentadienyl silane (Tb: 135–140° C.; 1 mm Hg), (8.7 g, 28.6 mmol, yield: 52%). 1H-RMN(CDCl3): 6.82–6.40 (m, 7H); 3.82 (m, 2H); 3.10 (m, 2H); 2.73 (m, 2H); 0.20 (s, 15 H). A purple solution was immediately formed Then, the volatiles were removed the residue was washed with hexane to give a pink solid A pink suspension was immediately formed the solvents were removed the residue was treated with hexane the supernatant solution was filtered The removal of the hexane This oil was distilled in order to obtain a yellow oil, which

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

Procedure: To a suspension of 0.63 g (26.3 mmol) of HNa in THF at −78° C., a solution of 6.3 g (26.3 mmol) of cyclopentadienylindenyldimethylsilane in THF was added. Immediately a purple solution was formed. Then, the volatiles were removed and the residue was washed with hexane to give a pink solid. The solid was solved again in THF and a solution of 5.2 g (26.3 mmol) of 2-bromo-1-trimethylsiloxyethane in THF was added at room temperature. A white suspension was formed immediately. The mixture was stirred for 12 h, and then the solvents were removed and the residue was treated with hexane and the supernatant solution was filtered. The removal of the hexane led to a brown oil. This oil was distilled in order to obtain a yellow-orange oil, which was characterized as a mixture of position isomers of (2-trimethylsiloxyethylindenyl) cyclopentadienyl dimethyl silane. (Tb: 170–175° C.; 1 mm Hg), (3.9 g, 11 mmol, yield: 42%). 1H-RMN(CDCl3): 7.54–7.42 (m, 2H); 7.31–7.12 (m, 2H); 6.95 (m, 1H); 6.91 (m, 1H); 6.72 (m, 1H); 6.61 (m, 1H); 6.60–6.42 (m, 3H); 3.78 (m, 2H); 3.62 (m, 1H); 3.42 (m, 2H); 2.62 (m, 2H); 0.17 (m, 15 H). Immediately a purple solution was formed Then, the volatiles were removed the residue was washed with hexane to give a pink solid A white suspension was formed immediately the solvents were removed the residue was treated with hexane the supernatant solution was filtered The removal of the hexane This oil was distilled in order to obtain a yellow-orange oil, which (Tb: 170–175° C.; 1 mm Hg), (3.9 g, 11 mmol, yield: 42%)

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

Procedure: To a suspension of 0.63 g (26.3 mmol) of HNa in THF at −78° C., a solution of 6.3 g (26.3 mmol) of cyclopentadienylindenyldimethylsilane in THF was added. Immediately a purple solution was formed. Then, the volatiles were removed and the residue was washed with hexane to give a pink solid. The solid was solved again in THF and a solution of 5.2 g (26.3 mmol) of 2-bromo-1-trimethylsiloxyethane in THF was added at room temperature. A white suspension was formed immediately. The mixture was stirred for 12 h, and then the solvents were removed and the residue was treated with hexane and the supernatant solution was filtered. The removal of the hexane led to a brown oil. This oil was distilled in order to obtain a yellow-orange oil, which was characterized as a mixture of position isomers of (2-trimethylsiloxyethylindenyl) cyclopentadienyl dimethyl silane. (Tb: 170–175° C.; 1 mm Hg), (3.9 g, 11 mmol, yield: 42%). 1H-RMN(CDCl3): 7.54–7.42 (m, 2H); 7.31–7.12 (m, 2H); 6.95 (m, 1H); 6.91 (m, 1H); 6.72 (m, 1H); 6.61 (m, 1H); 6.60–6.42 (m, 3H); 3.78 (m, 2H); 3.62 (m, 1H); 3.42 (m, 2H); 2.62 (m, 2H); 0.17 (m, 15 H). Immediately a purple solution was formed Then, the volatiles were removed the residue was washed with hexane to give a pink solid A white suspension was formed immediately the solvents were removed the residue was treated with hexane the supernatant solution was filtered The removal of the hexane This oil was distilled in order to obtain a yellow-orange oil, which (Tb: 170–175° C.; 1 mm Hg), (3.9 g, 11 mmol, yield: 42%)

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To the title compound from Example 1 Step C (0.5 mmol, 210 mg) in 1 mL of THF was added a solution of NaH (1 mmol, 40 mg of 60% slurry in mineral oil) in 1 mL of DMF (exothermic, H2 evolution). After gas evolution ceased for several minutes, (2-bromoethoxy)(trimethyl)silane was added to the solution via syringe. The reaction mixture was heated to 40° C. After 2.5 h the reaction was quenched by addition of saturated ammonium chloride. The product was extracted 3× with EtOAc and the organic phase was dried over MgSO4 and concentrated under reduced pressure. The crude product was purified by flash chromatography on silica eluting with 5% EtOAc/hexanes. HPLC A: 3.14 min. After gas evolution ceased for several minutes After 2.5 h the reaction was quenched by addition of saturated ammonium chloride The product was extracted 3× with EtOAc the organic phase was dried over MgSO4 concentrated under reduced pressure The crude product was purified by flash chromatography on silica eluting with 5% EtOAc/hexanes 3.14 min.

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To the title compound from Example 1 Step C (0.5 mmol, 210 mg) in 1 mL of THF was added a solution of NaH (1 mmol, 40 mg of 60% slurry in mineral oil) in 1 mL of DMF (exothermic, H2 evolution). After gas evolution ceased for several minutes, (2-bromoethoxy)(trimethyl)silane was added to the solution via syringe. The reaction mixture was heated to 40° C. After 2.5 h the reaction was quenched by addition of saturated ammonium chloride. The product was extracted 3× with EtOAc and the organic phase was dried over MgSO4 and concentrated under reduced pressure. The crude product was purified by flash chromatography on silica eluting with 5% EtOAc/hexanes. HPLC A: 3.14 min. After gas evolution ceased for several minutes After 2.5 h the reaction was quenched by addition of saturated ammonium chloride The product was extracted 3× with EtOAc the organic phase was dried over MgSO4 concentrated under reduced pressure The crude product was purified by flash chromatography on silica eluting with 5% EtOAc/hexanes 3.14 min.

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

Procedure: A suspension of potassium tert-butoxide (12.3 g) in toluene (200 mL) was treated dropwise with a mixture of phenylacetonitrile (12.9 g) and (2-bromoethoxy)trimethyl-silane (23.8 g) at room temperature. Upon completion of the addition, the reaction mixture was refluxed for 5 h, then cooled to room temperature and quenched by pouring onto a mixture of ice and water. The formed organic phase was separated and the aqueous phase was extracted with benzene. The combined organic phases were washed with water, dried over magnesium sulfate, filtered and concentrated on a rotary evaporator to give 2-phenyl-4-trimethylsilanyloxy-butyronitrile. The obtained butyronitrile derivative was redissolved in a mixture of ethanol (40 mL) and 70% aqueous sulfuric acid (40 mL), stirred at 50° C. for 3 h and, after cooling to room temperature, diluted with water (150 mL). The resulted organic phase was separated and the aqueous phase was extracted with benzene. The combined organic phases were washed with water, then with saturated aqueous solution of sodium bicarbonate, dried over magnesium sulfate, filtered, concentrated on a rotary evaporator and distilled in vacuum to give 11.0 g (62%) of the title compound. Upon completion of the addition the reaction mixture was refluxed for 5 h quenched by pouring onto a mixture of ice and water The formed organic phase was separated the aqueous phase was extracted with benzene The combined organic phases were washed with water dried over magnesium sulfate filtered concentrated on a rotary evaporator

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

Procedure: A suspension of potassium tert-butoxide (12.3 g) in toluene (200 mL) was treated dropwise with a mixture of phenylacetonitrile (12.9 g) and (2-bromoethoxy)trimethyl-silane (23.8 g) at room temperature. Upon completion of the addition, the reaction mixture was refluxed for 5 h, then cooled to room temperature and quenched by pouring onto a mixture of ice and water. The formed organic phase was separated and the aqueous phase was extracted with benzene. The combined organic phases were washed with water, dried over magnesium sulfate, filtered and concentrated on a rotary evaporator to give 2-phenyl-4-trimethylsilanyloxy-butyronitrile. The obtained butyronitrile derivative was redissolved in a mixture of ethanol (40 mL) and 70% aqueous sulfuric acid (40 mL), stirred at 50° C. for 3 h and, after cooling to room temperature, diluted with water (150 mL). The resulted organic phase was separated and the aqueous phase was extracted with benzene. The combined organic phases were washed with water, then with saturated aqueous solution of sodium bicarbonate, dried over magnesium sulfate, filtered, concentrated on a rotary evaporator and distilled in vacuum to give 11.0 g (62%) of the title compound. Upon completion of the addition the reaction mixture was refluxed for 5 h quenched by pouring onto a mixture of ice and water The formed organic phase was separated the aqueous phase was extracted with benzene The combined organic phases were washed with water dried over magnesium sulfate filtered concentrated on a rotary evaporator

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

Procedure: 150 ml of a 2.3 M sodium cyclopentadienylide solution in tetrahydrofurane (346 mmol) is slowly added to a solution of 68.2 g (346 mmol) 2-trimethylsiloxy-1-bromo-ethane in tetrahydrofurane. The immediate formation of a pinkish solid is observed. The reaction is maintained under stirring for 12 hours. Then, an ammonium chloride aqueous solution is added. The organic phase is extracted, dried with magnesium sulphate and the volatile part is distilled under vacuum, obtaining an orange oil. This oil is distilled in order to obtain a colorless oil. (Tb.: 63-65° C., 0.02 bar (15 mmHg.)). (40.3 g, 221 mmol. Yield:64%). 1H-NMR (CDCl3): 6.50-6.00 (m,3H), 3.75 (m,2H), 2.95 (m,2H), 2.65 (m,2H), 0.15 (s,9H). The reaction is maintained The organic phase is extracted dried with magnesium sulphate the volatile part is distilled under vacuum obtaining an orange oil This oil is distilled in order to obtain a colorless oil (Tb.: 63-65° C., 0.02 bar (15 mmHg.))

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

Procedure: 150 ml of a 2.3 M sodium cyclopentadienide solution in tetrahydrofurane (346 mmol) is slowly added to a solution of 68.2 g (346 mmol) 2-trimethylsiloxy-1-bromo-ethane in tetrahydrofurane. The immediate formation of a pinkish solid is observed. The reaction is maintained under stirring for 12 hours. Then, an ammonium chloride aqueous solution is added. The organic phase is extracted, dried with magnesium sulphate and the volatile part is distilled under vacuum, obtaining an orange oil. This oil is distilled in order to obtain a colourless oil. (Tb.: 63–65° C., 0.02 bar (15 mmHg.)). (40.3 g, 221 mmol. Yield:64%). 1H-NMR (CDCl3): 6.50–6.00 (m,3H), 3.75 (m, 2H), 2.95 (m, 2H), 2.65 (m, 2H), 0.15 (s, 9H). The reaction is maintained The organic phase is extracted dried with magnesium sulphate the volatile part is distilled under vacuum obtaining an orange oil This oil is distilled in order to obtain a colourless oil (Tb.: 63–65° C., 0.02 bar (15 mmHg.))

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

Procedure: A solution of 11.5 g (61 mmol) of biscyclopentadienyidimethylsilane in THF was added to a suspension of 1.3 g (55 mmol) of HK in THF at −78° C. A purple solution was immediately formed. Then, the volatiles were removed and the residue was washed with hexane to give a pink solid. The solid was solved again in THF and a solution of 10.8 g (55 mmol) of 2-bromo-1-trimethylsiloxyethane in THF was added at room temperature. A pink suspension was immediately formed. The mixture was stirred for 12 h, and then the solvents were removed, the residue was treated with hexane and the supernatant solution was filtered. The removal of the hexane led to a reddish oil. This oil was distilled in order to obtain a yellow oil, which was characterized as a mixture of position isomers of (2-trimethylsiloxyethylcyclopentadienyl) dimethyl cyclopentadienyl silane (Tb: 135–140° C.; 1 mm Hg), (8.7 g, 28.6 mmol, yield: 52%). 1H-RMN(CDCl3): 6.82–6.40 (m, 7H); 3.82 (m, 2H); 3.10 (m, 2H); 2.73 (m, 2H); 0.20 (s, 15 H). A purple solution was immediately formed Then, the volatiles were removed the residue was washed with hexane to give a pink solid A pink suspension was immediately formed the solvents were removed the residue was treated with hexane the supernatant solution was filtered The removal of the hexane This oil was distilled in order to obtain a yellow oil, which

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

Procedure: To a suspension of 0.63 g (26.3 mmol) of HNa in THF at −78° C., a solution of 6.3 g (26.3 mmol) of cyclopentadienylindenyldimethylsilane in THF was added. Immediately a purple solution was formed. Then, the volatiles were removed and the residue was washed with hexane to give a pink solid. The solid was solved again in THF and a solution of 5.2 g (26.3 mmol) of 2-bromo-1-trimethylsiloxyethane in THF was added at room temperature. A white suspension was formed immediately. The mixture was stirred for 12 h, and then the solvents were removed and the residue was treated with hexane and the supernatant solution was filtered. The removal of the hexane led to a brown oil. This oil was distilled in order to obtain a yellow-orange oil, which was characterized as a mixture of position isomers of (2-trimethylsiloxyethylindenyl) cyclopentadienyl dimethyl silane. (Tb: 170–175° C.; 1 mm Hg), (3.9 g, 11 mmol, yield: 42%). 1H-RMN(CDCl3): 7.54–7.42 (m, 2H); 7.31–7.12 (m, 2H); 6.95 (m, 1H); 6.91 (m, 1H); 6.72 (m, 1H); 6.61 (m, 1H); 6.60–6.42 (m, 3H); 3.78 (m, 2H); 3.62 (m, 1H); 3.42 (m, 2H); 2.62 (m, 2H); 0.17 (m, 15 H). Immediately a purple solution was formed Then, the volatiles were removed the residue was washed with hexane to give a pink solid A white suspension was formed immediately the solvents were removed the residue was treated with hexane the supernatant solution was filtered The removal of the hexane This oil was distilled in order to obtain a yellow-orange oil, which (Tb: 170–175° C.; 1 mm Hg), (3.9 g, 11 mmol, yield: 42%)

Conditions: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To the title compound from Example 1 Step C (0.5 mmol, 210 mg) in 1 mL of THF was added a solution of NaH (1 mmol, 40 mg of 60% slurry in mineral oil) in 1 mL of DMF (exothermic, H2 evolution). After gas evolution ceased for several minutes, (2-bromoethoxy)(trimethyl)silane was added to the solution via syringe. The reaction mixture was heated to 40° C. After 2.5 h the reaction was quenched by addition of saturated ammonium chloride. The product was extracted 3× with EtOAc and the organic phase was dried over MgSO4 and concentrated under reduced pressure. The crude product was purified by flash chromatography on silica eluting with 5% EtOAc/hexanes. HPLC A: 3.14 min. After gas evolution ceased for several minutes After 2.5 h the reaction was quenched by addition of saturated ammonium chloride The product was extracted 3× with EtOAc the organic phase was dried over MgSO4 concentrated under reduced pressure The crude product was purified by flash chromatography on silica eluting with 5% EtOAc/hexanes 3.14 min.