5',5'-dimethylspiro[1,3,3a,4,6,6a-hexahydropentalene-5,2'-1,3-dioxane]-2-one

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

Procedure: Sodium hydride (60% dispersion in mineral oil, 134 mg, 3.34 mmol) was suspended in THF (2 mL) and cooled to 0° C. Triethylphopsphonoacetate (0.55 g, 2.45 mmol) was added dropwise and the mixture was stirred at 0° C. for 30 min. The product of Step 1 (500 mg, 2.229 mmol) was added dropwise as a solution in THF (0.5 mL) and the reaction mixture was stirred 16 hrs while warming from 0° C. to room temperature. The mixture was partitioned between EtOAc and water, the organic layer dried over Na2SO4, concentrated under reduced pressure and the residue was purified by flash chromatography (7 to 60% EtOAc in hexanes) to give ethyl[5,5-dimethyltetrahydro-1′H-spiro[1,3-dioxane-2,2′-pentalen]-5′(3′H)-ylidene]ethanoate (460 mg, 1.563 mmol, 70.1% yield) as a colorless oil. MS ESI: [M+Na]+ m/z 295.7. Triethylphopsphonoacetate (0.55 g, 2.45 mmol) was added dropwise the reaction mixture was stirred 16 hrs while warming from 0° C. to room temperature The mixture was partitioned between EtOAc and water the organic layer dried over Na2SO4 concentrated under reduced pressure the residue was purified by flash chromatography (7 to 60% EtOAc in hexanes)

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a of solution cis-tetrahydropentalene-2,5-(1H,3H)-dione (2.99 g, 21.6 mmol) and 2,2-dimethylpropane-1,3-diol (2.254 g, 21.6 mmol) in toluene (70 mL) was added p-toluenesulfonic acid monohydrate (0.206 g, 1.08 mmol) and the mixture was heated at 110° C. for 24 hrs with a Dean Stark apparatus. The reaction mixture was cooled to room temperature, poured over solid K2CO3, stirred 5 mins then filtered and concentrated under reduced pressure. The residue was purified by flash chromatography (12 to 100% EtOAc in hexanes) to give 5,5-dimethyltetrahydro-1′H-spiro[1,3-dioxane-2,2′-pentalen]-5′(3′H)-one (2.224 g, 9.92 mmol, 45.8% yield) as a colorless oil which solidified upon standing. MS ESI: [M+Na]+ m/z 225.7. The reaction mixture was cooled to room temperature then filtered concentrated under reduced pressure The residue was purified by flash chromatography (12 to 100% EtOAc in hexanes)

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

Procedure: Sodium hydride (60% dispersion in mineral oil, 134 mg, 3.34 mmol) was suspended in THF (2 mL) and cooled to 0° C. Triethylphopsphonoacetate (0.55 g, 2.45 mmol) was added dropwise and the mixture was stirred at 0° C. for 30 min. The product of Step 1 (500 mg, 2.229 mmol) was added dropwise as a solution in THF (0.5 mL) and the reaction mixture was stirred 16 hrs while warming from 0° C. to room temperature. The mixture was partitioned between EtOAc and water, the organic layer dried over Na2SO4, concentrated under reduced pressure and the residue was purified by flash chromatography (7 to 60% EtOAc in hexanes) to give ethyl[5,5-dimethyltetrahydro-1′H-spiro[1,3-dioxane-2,2′-pentalen]-5′(3′H)-ylidene]ethanoate (460 mg, 1.563 mmol, 70.1% yield) as a colorless oil. MS ESI: [M+Na]+ m/z 295.7. Triethylphopsphonoacetate (0.55 g, 2.45 mmol) was added dropwise the reaction mixture was stirred 16 hrs while warming from 0° C. to room temperature The mixture was partitioned between EtOAc and water the organic layer dried over Na2SO4 concentrated under reduced pressure the residue was purified by flash chromatography (7 to 60% EtOAc in hexanes)

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

Procedure: Sodium hydride (60% dispersion in mineral oil, 134 mg, 3.34 mmol) was suspended in THF (2 mL) and cooled to 0° C. Triethylphopsphonoacetate (0.55 g, 2.45 mmol) was added dropwise and the mixture was stirred at 0° C. for 30 min. The product of Step 1 (500 mg, 2.229 mmol) was added dropwise as a solution in THF (0.5 mL) and the reaction mixture was stirred 16 hrs while warming from 0° C. to room temperature. The mixture was partitioned between EtOAc and water, the organic layer dried over Na2SO4, concentrated under reduced pressure and the residue was purified by flash chromatography (7 to 60% EtOAc in hexanes) to give ethyl[5,5-dimethyltetrahydro-1′H-spiro[1,3-dioxane-2,2′-pentalen]-5′(3′H)-ylidene]ethanoate (460 mg, 1.563 mmol, 70.1% yield) as a colorless oil. MS ESI: [M+Na]+ m/z 295.7. Triethylphopsphonoacetate (0.55 g, 2.45 mmol) was added dropwise the reaction mixture was stirred 16 hrs while warming from 0° C. to room temperature The mixture was partitioned between EtOAc and water the organic layer dried over Na2SO4 concentrated under reduced pressure the residue was purified by flash chromatography (7 to 60% EtOAc in hexanes)

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a of solution cis-tetrahydropentalene-2,5-(1H,3H)-dione (2.99 g, 21.6 mmol) and 2,2-dimethylpropane-1,3-diol (2.254 g, 21.6 mmol) in toluene (70 mL) was added p-toluenesulfonic acid monohydrate (0.206 g, 1.08 mmol) and the mixture was heated at 110° C. for 24 hrs with a Dean Stark apparatus. The reaction mixture was cooled to room temperature, poured over solid K2CO3, stirred 5 mins then filtered and concentrated under reduced pressure. The residue was purified by flash chromatography (12 to 100% EtOAc in hexanes) to give 5,5-dimethyltetrahydro-1′H-spiro[1,3-dioxane-2,2′-pentalen]-5′(3′H)-one (2.224 g, 9.92 mmol, 45.8% yield) as a colorless oil which solidified upon standing. MS ESI: [M+H]+ m/z 225.7. The reaction mixture was cooled to room temperature then filtered concentrated under reduced pressure The residue was purified by flash chromatography (12 to 100% EtOAc in hexanes)

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

Procedure: Sodium hydride (60% dispersion in mineral oil, 134 mg, 3.34 mmol) was suspended in THF (2 mL) and cooled to 0° C. Triethylphopsphonoacetate (0.55 g, 2.45 mmol) was added dropwise and the mixture was stirred at 0° C. for 30 min. The product of Step 1 (500 mg, 2.229 mmol) was added dropwise as a solution in THF (0.5 mL) and the reaction mixture was stirred 16 hrs while warming from 0° C. to room temperature. The mixture was partitioned between EtOAc and water, the organic layer dried over Na2SO4, concentrated under reduced pressure and the residue was purified by flash chromatography (7 to 60% EtOAc in hexanes) to give ethyl[5,5-dimethyltetrahydro-1′H-spiro[1,3-dioxane-2,2′-pentalen]-5′(3′H)-ylidene]ethanoate (460 mg, 1.563 mmol, 70.1% yield) as a colorless oil. MS ESI: [M+Na]+ m/z 295.7. Triethylphopsphonoacetate (0.55 g, 2.45 mmol) was added dropwise the reaction mixture was stirred 16 hrs while warming from 0° C. to room temperature The mixture was partitioned between EtOAc and water the organic layer dried over Na2SO4 concentrated under reduced pressure the residue was purified by flash chromatography (7 to 60% EtOAc in hexanes)

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a of solution cis-tetrahydropentalene-2,5-(1H,3H)-dione (2.99 g, 21.6 mmol) and 2,2-dimethylpropane-1,3-diol (2.254 g, 21.6 mmol) in toluene (70 mL) was added p-toluenesulfonic acid monohydrate (0.206 g, 1.08 mmol) and the mixture was heated at 110° C. for 24 hrs with a Dean Stark apparatus. The reaction mixture was cooled to room temperature, poured over solid K2CO3, stirred 5 mins then filtered and concentrated under reduced pressure. The residue was purified by flash chromatography (12 to 100% EtOAc in hexanes) to give 5,5-dimethyltetrahydro-1′H-spiro[1,3-dioxane-2,2′-pentalen]-5′(3′H)-one (2.224 g, 9.92 mmol, 45.8% yield) as a colorless oil which solidified upon standing. MS ESI: [M+Na]+ m/z 225.7. The reaction mixture was cooled to room temperature then filtered concentrated under reduced pressure The residue was purified by flash chromatography (12 to 100% EtOAc in hexanes)

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a of solution cis-tetrahydropentalene-2,5-(1H,3H)-dione (2.99 g, 21.6 mmol) and 2,2-dimethylpropane-1,3-diol (2.254 g, 21.6 mmol) in toluene (70 mL) was added p-toluenesulfonic acid monohydrate (0.206 g, 1.08 mmol) and the mixture was heated at 110° C. for 24 hrs with a Dean Stark apparatus. The reaction mixture was cooled to room temperature, poured over solid K2CO3, stirred 5 mins then filtered and concentrated under reduced pressure. The residue was purified by flash chromatography (12 to 100% EtOAc in hexanes) to give 5,5-dimethyltetrahydro-1′H-spiro[1,3-dioxane-2,2′-pentalen]-5′(3′H)-one (2.224 g, 9.92 mmol, 45.8% yield) as a colorless oil which solidified upon standing. MS ESI: [M+Na]+ m/z 225.7. The reaction mixture was cooled to room temperature then filtered concentrated under reduced pressure The residue was purified by flash chromatography (12 to 100% EtOAc in hexanes)

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

Procedure: Sodium hydride (60% dispersion in mineral oil, 134 mg, 3.34 mmol) was suspended in THF (2 mL) and cooled to 0° C. Triethylphopsphonoacetate (0.55 g, 2.45 mmol) was added dropwise and the mixture was stirred at 0° C. for 30 min. The product of Step 1 (500 mg, 2.229 mmol) was added dropwise as a solution in THF (0.5 mL) and the reaction mixture was stirred 16 hrs while warming from 0° C. to room temperature. The mixture was partitioned between EtOAc and water, the organic layer dried over Na2SO4, concentrated under reduced pressure and the residue was purified by flash chromatography (7 to 60% EtOAc in hexanes) to give ethyl[5,5-dimethyltetrahydro-1′H-spiro[1,3-dioxane-2,2′-pentalen]-5′(3′H)-ylidene]ethanoate (460 mg, 1.563 mmol, 70.1% yield) as a colorless oil. MS ESI: [M+Na]+ m/z 295.7. Triethylphopsphonoacetate (0.55 g, 2.45 mmol) was added dropwise the reaction mixture was stirred 16 hrs while warming from 0° C. to room temperature The mixture was partitioned between EtOAc and water the organic layer dried over Na2SO4 concentrated under reduced pressure the residue was purified by flash chromatography (7 to 60% EtOAc in hexanes)

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a of solution cis-tetrahydropentalene-2,5-(1H,3H)-dione (2.99 g, 21.6 mmol) and 2,2-dimethylpropane-1,3-diol (2.254 g, 21.6 mmol) in toluene (70 mL) was added p-toluenesulfonic acid monohydrate (0.206 g, 1.08 mmol) and the mixture was heated at 110° C. for 24 hrs with a Dean Stark apparatus. The reaction mixture was cooled to room temperature, poured over solid K2CO3, stirred 5 mins then filtered and concentrated under reduced pressure. The residue was purified by flash chromatography (12 to 100% EtOAc in hexanes) to give 5,5-dimethyltetrahydro-1′H-spiro[1,3-dioxane-2,2′-pentalen]-5′(3′H)-one (2.224 g, 9.92 mmol, 45.8% yield) as a colorless oil which solidified upon standing. MS ESI: [M+H]+ m/z 225.7. The reaction mixture was cooled to room temperature then filtered concentrated under reduced pressure The residue was purified by flash chromatography (12 to 100% EtOAc in hexanes)

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

Procedure: Sodium hydride (60% dispersion in mineral oil, 134 mg, 3.34 mmol) was suspended in THF (2 mL) and cooled to 0° C. Triethylphopsphonoacetate (0.55 g, 2.45 mmol) was added dropwise and the mixture was stirred at 0° C. for 30 min. The product of Step 1 (500 mg, 2.229 mmol) was added dropwise as a solution in THF (0.5 mL) and the reaction mixture was stirred 16 hrs while warming from 0° C. to room temperature. The mixture was partitioned between EtOAc and water, the organic layer dried over Na2SO4, concentrated under reduced pressure and the residue was purified by flash chromatography (7 to 60% EtOAc in hexanes) to give ethyl[5,5-dimethyltetrahydro-1′H-spiro[1,3-dioxane-2,2′-pentalen]-5′(3′H)-ylidene]ethanoate (460 mg, 1.563 mmol, 70.1% yield) as a colorless oil. MS ESI: [M+Na]+ m/z 295.7. Triethylphopsphonoacetate (0.55 g, 2.45 mmol) was added dropwise the reaction mixture was stirred 16 hrs while warming from 0° C. to room temperature The mixture was partitioned between EtOAc and water the organic layer dried over Na2SO4 concentrated under reduced pressure the residue was purified by flash chromatography (7 to 60% EtOAc in hexanes)

Conditions: temp:110.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a of solution cis-tetrahydropentalene-2,5-(1H,3H)-dione (2.99 g, 21.6 mmol) and 2,2-dimethylpropane-1,3-diol (2.254 g, 21.6 mmol) in toluene (70 mL) was added p-toluenesulfonic acid monohydrate (0.206 g, 1.08 mmol) and the mixture was heated at 110° C. for 24 hrs with a Dean Stark apparatus. The reaction mixture was cooled to room temperature, poured over solid K2CO3, stirred 5 mins then filtered and concentrated under reduced pressure. The residue was purified by flash chromatography (12 to 100% EtOAc in hexanes) to give 5,5-dimethyltetrahydro-1′H-spiro[1,3-dioxane-2,2′-pentalen]-5′(3′H)-one (2.224 g, 9.92 mmol, 45.8% yield) as a colorless oil which solidified upon standing. MS ESI: [M+Na]+ m/z 225.7. The reaction mixture was cooled to room temperature then filtered concentrated under reduced pressure The residue was purified by flash chromatography (12 to 100% EtOAc in hexanes)