1,4-Dioxaspiro[4.5]decane-8-acetic acid, ethyl ester

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: (1,4-Dioxa-spiro[4.5]dec-8-ylidene)-acetic acid ethyl ester (1.10 g, 4.86 mmol) was dissolved in 30 ml ethyl acetate and stirred with 110 mg Pd/C 10% under hydrogen atmosphere for 4 hours. The catalyst was filtered off and the solvent evaporated. The crude product (1.08 g, 97%) [MS: m/e=229.3 (M+H+)] was obtained as a colourless liquid and used without any further purification for the next step. The catalyst was filtered off the solvent evaporated

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

Procedure: A solution of ethyl 1,4-dioxaspiro[4,5]decane-8-acetate (50.0 g) in 50 mL of 4.8N sodium hydroxide solution and 400 mL of ethanol is refluxed under nitrogen for 2 hours. The mixture is concentrated in vacuo to remove the ethanol. The residue is acidified with a saturated sodium biphosphate solution and the mixture is extracted with ethyl acetate (2×300 mL). The organic extract is dried over magnesium sulfate, and evaporated in vacuo to give an oily solid which is triturated with hexane and filtered to give 38.25 g of the title compound as a white solid; mp 110°-113° C. The mixture is concentrated in vacuo to remove the ethanol the mixture is extracted with ethyl acetate (2×300 mL) The organic extract is dried over magnesium sulfate evaporated in vacuo to give an oily solid which is triturated with hexane filtered

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of lithium aluminium hydride (831 mg) and anhydrous tetrahydrofuran (70 ml) at 0° C. was added a solution of ethyl 1,4-dioxaspiro[4.5]decane-8-acetate of Example 90 (2) (5.0 g) in anhydrous tetrahydrofuran (30 ml). The mixture was gradually warmed to about 25° C., stirred for 3 hours, and then sodium fluoride, water and dichloromethane were added to the reaction mixture. The precipitate was filtrated off with Celite, the filtrated organic layer was dried over sodium sulfate. The solvent was removed in vacuo from the organic layer to give 4.18 g of 8-(2-hydroxyethyl)-1,4-dioxaspiro[4.5]decane. The precipitate was filtrated off with Celite the filtrated organic layer was dried over sodium sulfate The solvent was removed in vacuo from the organic layer

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

Procedure: (1,4-Dioxa-spiro[4.5]dec-8-ylidene)-acetic acid ethyl ester (1.10 g, 4.86 mmol) was dissolved in 30 ml ethyl acetate and stirred with 110 mg Pd/C 10% under hydrogen atmosphere for 4 hours. The catalyst was filtered off and the solvent evaporated. The crude product (1.08 g, 97%) [MS: m/e=229.3 (M+H+)] was obtained as a colourless liquid and used without any further purification for the next step. The catalyst was filtered off the solvent evaporated

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

Procedure: (1,4-Dioxa-spiro[4.5]dec-8-ylidene)-acetic acid ethyl ester (1.10 g, 4.86 mmol) was dissolved in 30 ml ethyl acetate and stirred with 110 mg Pd/C 10% under hydrogen atmosphere for 4 hours. The catalyst was filtered off and the solvent evaporated. The crude product (1.08 g, 97%) [MS: m/e=229.3 (M+H+)] was obtained as a colourless liquid and used without any further purification for the next step. The catalyst was filtered off the solvent evaporated

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

Procedure: Ethyl 1,4-dioxaspiro[4.5]dec-8-ylacetate (3.40 g, 0.0149 mol) prepared according to the procedure of Itagaki, Noriaki; Kimura, Mari; Sugahara, Tsutomu; Iwabuchi, Yoshiharu. (Organic Letters 2005; 7 (19); 4181-4183.) was dissolved in ether (30.00 mL) and the mixture was cooled to 0° C. To the reaction was added 1.00 M lithium tetrahydroaluminate in ether (15.0 mL) and the resulting mixture was stirred at 0° C. for 60 minutes and at 25° C. for 2 hours. The reaction was cooled and water (0.40 mL, 0.022 mol) was added, followed by 1.00 M sodium hydroxide (0.40 mL). To the reaction was then added ether (100.00 mL) and the solid that precipitated was filtered off. The filtrate was concentrated using a rotary evaporator to give the product. 1H NMR(CDCl3): 3.94 (s, 4H), 3.67 (t, 2H), 1.20-1.80 (m, 11H). The reaction was cooled added ether (100.00 mL) and the solid that precipitated was filtered off The filtrate was concentrated a rotary evaporator to give the product

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

Procedure: Ethyl 1,4-dioxaspiro[4.5]dec-8-ylacetate (3.40 g, 0.0149 mol) prepared according to the procedure of Itagaki, Noriaki; Kimura, Mari; Sugahara, Tsutomu; Iwabuchi, Yoshiharu. (Organic Letters 2005; 7(19); 4181-4183.) was dissolved in ether (30.00 mL) and the mixture was cooled to 0° C. To the reaction was added 1.00 M lithium tetrahydroaluminate in ether (15.0 mL) and the resulting mixture was stirred at 0° C. for 60 minutes and at 25° C. for 2 hours. The reaction was cooled and water (0.40 mL, 0.022 mol) was added, followed by 1.00 M sodium hydroxide (0.40 mL). To the reaction was then added ether (100.00 mL) and the solid that precipitated was filtered off. The filtrate was concentrated using a rotary evaporator to give the product. 1H NMR (CDCl3): 3.94 (s, 4H), 3.67 (t, 2H), 1.20-1.80 (m, 11H). The reaction was cooled added ether (100.00 mL) and the solid that precipitated was filtered off The filtrate was concentrated a rotary evaporator to give the product

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: Ethyl 1,4-dioxaspiro[4.5]dec-8-ylacetate (3.40 g, 0.0149 mol) prepared according to the procedure of Itagaki, Noriaki; Kimura, Mari; Sugahara, Tsutomu; Iwabuchi, Yoshiharu. (Organic Letters 2005; 7 (19); 4181-4183.) was dissolved in ether (30.00 mL) and the mixture was cooled to 0° C. To the reaction was added 1.00 M lithium tetrahydroaluminate in ether (15.0 mL) and the resulting mixture was stirred at 0° C. for 60 minutes and at 25° C. for 2 hours. The reaction was cooled and water (0.40 mL, 0.022 mol) was added, followed by 1.00 M sodium hydroxide (0.40 mL). To the reaction was then added ether (100.00 mL) and the solid that precipitated was filtered off. The filtrate was concentrated using a rotary evaporator to give the product. 1H NMR(CDCl3): 3.94 (s, 4H), 3.67 (t, 2H), 1.20-1.80 (m, 11H). The reaction was cooled added ether (100.00 mL) and the solid that precipitated was filtered off The filtrate was concentrated a rotary evaporator to give the product