1,4-dioxaspiro[4.5]decane-8-carbaldehyde

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

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

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: 40 percent strength aqueous dimethylamine solution (85 ml, 0.67 mol), 1,4-dioxa-spiro[4.5]decane-8-carbaldehyde (240 g, 0.141 mol) and potassium cyanide (22.05 g, 0.338 mol) were added to a mixture of 4 N hydrochloric acid (37 ml) and methanol (22 ml), while cooling with ice. The mixture was stirred at room temperature for 4 d and then, after addition of water (80 ml), extracted with diethyl ether (4×100 ml). The organic phase was dried over sodium sulfate and concentrated i. vac. and the product was obtained as a white solid. Yield: 25.2 g (81%), melting point: 48-51° C. while cooling with ice extracted with diethyl ether (4×100 ml) The organic phase was dried over sodium sulfate concentrated i and the product was obtained as a white solid

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

Procedure: Diisobutylaluminium hydride (1.5 M solution in toluene, 102 ml, 153 mmol) was added dropwise to a solution of 1,4-dioxa-spiro[4.5]decane-8-carboxylic acid ethyl ester (32.13 g, 150 mmol) in absol. toluene (160 ml) at −70 to −65° C. under argon and the mixture was stirred for 30 min. The mixture was then quenched at −70 to −60° C. by addition of methanol (80 ml). The reaction solution was warmed to RT, saturated sodium chloride solution (100 ml) was added and the reaction solution was filtered out with suction over kieselguhr. The kieselguhr was washed twice with ethyl acetate and the aqueous solution was separated off and extracted twice with ethyl acetate. The combined organic extracts were washed with saturated sodium chloride solution, dried over sodium sulfate and concentrated i. vac. Yield: 24.01 g (94%), yellow oil The mixture was then quenched at −70 to −60° C. by addition of methanol (80 ml) saturated sodium chloride solution (100 ml) was added the reaction solution was filtered out with suction over kieselguhr The kieselguhr was washed twice with ethyl acetate the aqueous solution was separated off extracted twice with ethyl acetate The combined organic extracts were washed with saturated sodium chloride solution dried over sodium sulfate concentrated i

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: 40 percent strength aqueous dimethylamine solution (85 ml, 0.67 mol), 1,4-dioxaspiro-[4.5]decane-8-carbaldehyde (240 g, 0.141 mol) and potassium cyanide (22.05 g, 0.338 mol) were added with ice cooling to a mixture of 4N hydrochloric acid (37 ml) and methanol (22 ml). The mixture was stirred at room temperature for 4 d and then, after addition of water (80 ml), extracted with diethyl ether (4×100 ml). The organic phase was dried over sodium sulfate, evaporated under a vacuum and the product obtained as a white solid. extracted with diethyl ether (4×100 ml) The organic phase was dried over sodium sulfate evaporated under a vacuum the product obtained as a white solid

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

Procedure: A solution of 1,4-dioxaspiro[4.5]decane-8-carboxylic acid ethyl ester (32.13 g, 150 mmol) in absol. toluene (160 ml) was combined dropwise at −70 to −65° C. under argon with diisobutylaluminium hydride (1.5 M solution in toluene, 102 ml, 153 mmol) and stirred for 30 min. The batch was then quenched at −70 to −60° C. by addition of methanol (80 ml). The reaction solution was heated to RT, combined with saturated sodium chloride solution (100 ml) and the reaction solution removed by suction filtration through diatomaceous earth. The diatomaceous earth was washed twice with ethyl acetate, the aqueous solution separated and extracted twice with ethyl acetate. The combined organic extracts were washed with saturated sodium chloride solution, dried over sodium sulfate and evaporated under a vacuum. The batch was then quenched at −70 to −60° C. by addition of methanol (80 ml) the reaction solution removed by suction filtration through diatomaceous earth The diatomaceous earth was washed twice with ethyl acetate the aqueous solution separated extracted twice with ethyl acetate The combined organic extracts were washed with saturated sodium chloride solution dried over sodium sulfate evaporated under a vacuum

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

Procedure: A solution of 1,4-dioxaspiro[4.5]decane-8-carboxylic acid ethyl ester (32.13 g, 150 mmol) in absol. toluene (160 ml) was combined dropwise at −70 to −65° C. under argon with diisobutylaluminium hydride (1.5 M solution in toluene, 102 ml, 153 mmol) and stirred for 30 min. The batch was then quenched at −70 to −60° C. by addition of methanol (80 ml). The reaction solution was heated to RT, combined with saturated sodium chloride solution (100 ml) and the reaction solution removed by suction filtration through diatomaceous earth. The diatomaceous earth was washed twice with ethyl acetate, the aqueous solution separated and extracted twice with ethyl acetate. The combined organic extracts were washed with saturated sodium chloride solution, dried over sodium sulfate and evaporated under a vacuum. The batch was then quenched at −70 to −60° C. by addition of methanol (80 ml) the reaction solution removed by suction filtration through diatomaceous earth The diatomaceous earth was washed twice with ethyl acetate the aqueous solution separated extracted twice with ethyl acetate The combined organic extracts were washed with saturated sodium chloride solution dried over sodium sulfate evaporated under a vacuum

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

Procedure: 40% aqueous dimethylamine solution (85 ml, 0.67 mol), 1,4-dioxa-spiro[4.5]decane-8-carbaldehyde 2 (240 g, 0.141 mol) and potassium cyanide (22.05 g, 0.338 mol) were added, while cooling with ice, to a mixture of 4N hydrochloric acid (37 ml) and methanol (22 ml). The mixture was stirred for 4 d at room temperature and then, after addition of water (80 ml), extracted with diethyl ether (4×100 ml). The organic phase was dried over sodium sulfate and concentrated in vacuo, and the product was obtained in the form of a white solid. extracted with diethyl ether (4×100 ml) The organic phase was dried over sodium sulfate concentrated in vacuo the product was obtained in the form of a white solid