2,2-dimethyl-3a,7a-dihydro-1,3-benzodioxole

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

Procedure: Trans-1,2-bis(phenylsulfonyl)ethylene (1.37 g, 4.45 mmol) was added to a solution of the compound obtained in Step (12) in toluene, and air in a vessel containing the mixture was replaced with nitrogen. After having been refluxed for 8 hours, the mixture was concentrated under reduced pressure. The resultant reaction product was purified by silica gel chromatography (50% EtOAc/Hexane), whereby 10,11-bis(phenylsulfonyl)-4,4-dimethyl-3,5-dioxa-tricyclo[5.2.2.02.6]undec-8-ene was obtained (2.0 g, 98%). containing the mixture After having been refluxed for 8 hours the mixture was concentrated under reduced pressure The resultant reaction product was purified by silica gel chromatography (50% EtOAc/Hexane)

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

Procedure: Trans-1,2-bis(phenylsulfonyl)ethylene (1.37 g, 4.45 mmol) was added to a solution of the compound obtained in Step (12) in toluene, and air in a vessel containing the mixture was replaced with nitrogen. After having been refluxed for 8 hours, the mixture was concentrated under reduced pressure. The resultant reaction product was purified by silica gel chromatography (50% EtOAc/Hexane), whereby 10,11-bis(phenylsulfonyl)-4,4-dimethyl-3,5-dioxa-tricyclo[5.2.2.02.6]undec-8-ene was obtained (2.0 g, 98%). containing the mixture After having been refluxed for 8 hours the mixture was concentrated under reduced pressure The resultant reaction product was purified by silica gel chromatography (50% EtOAc/Hexane)

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

Procedure: The compound obtained in Step (11) was placed in a reaction vessel, and air in the vessel was replaced with nitrogen. After that, the compound was dissolved in dehydrated toluene (116 ml). Distilled DBU (6.0 ml, 40.1 mmol) was added to the solution, and the mixture was refluxed for 6 hours. After the reaction product had been filtrated, sodium hydrogen carbonate was added to the filtrate, and the organic layer was dried over magnesium sulfate, whereby 2,2-dimethyl-3a,7a-dihydrobenzo[1.3]dioxol was obtained. The compound was used in the next reaction without being further purified. the mixture was refluxed for 6 hours After the reaction product had been filtrated sodium hydrogen carbonate was added to the filtrate the organic layer was dried over magnesium sulfate

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

Procedure: The compound obtained in Step (11) was placed in a reaction vessel, and air in the vessel was replaced with nitrogen. After that, the compound was dissolved in dehydrated toluene (116 ml). Distilled DBU (6.0 ml, 40.1 mmol) was added to the solution, and the mixture was refluxed for 6 hours. After the reaction product had been filtrated, sodium hydrogen carbonate was added to the filtrate, and the organic layer was dried over magnesium sulfate, whereby 2,2-dimethyl-3a,7a-dihydrobenzo[1.3]dioxol was obtained. The compound was used in the next reaction without being further purified. the mixture was refluxed for 6 hours After the reaction product had been filtrated sodium hydrogen carbonate was added to the filtrate the organic layer was dried over magnesium sulfate

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

Procedure: Trans-1,2-bis(phenylsulfonyl)ethylene (1.37 g, 4.45 mmol) was added to a solution of the compound obtained in Step (12) in toluene, and air in a vessel containing the mixture was replaced with nitrogen. After having been refluxed for 8 hours, the mixture was concentrated under reduced pressure. The resultant reaction product was purified by silica gel chromatography (50% EtOAc/Hexane), whereby 10,11-bis(phenylsulfonyl)-4,4-dimethyl-3,5-dioxa-tricyclo[5.2.2.02.6]undec-8-ene was obtained (2.0 g, 98%). containing the mixture After having been refluxed for 8 hours the mixture was concentrated under reduced pressure The resultant reaction product was purified by silica gel chromatography (50% EtOAc/Hexane)

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

Procedure: The compound obtained in Step (11) was placed in a reaction vessel, and air in the vessel was replaced with nitrogen. After that, the compound was dissolved in dehydrated toluene (116 ml). Distilled DBU (6.0 ml, 40.1 mmol) was added to the solution, and the mixture was refluxed for 6 hours. After the reaction product had been filtrated, sodium hydrogen carbonate was added to the filtrate, and the organic layer was dried over magnesium sulfate, whereby 2,2-dimethyl-3a,7a-dihydrobenzo[1.3]dioxol was obtained. The compound was used in the next reaction without being further purified. the mixture was refluxed for 6 hours After the reaction product had been filtrated sodium hydrogen carbonate was added to the filtrate the organic layer was dried over magnesium sulfate

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

Procedure: Trans-1,2-bis(phenylsulfonyl)ethylene (1.37 g, 4.45 mmol) was added to a solution of the compound obtained in Step (12) in toluene, and air in a vessel containing the mixture was replaced with nitrogen. After having been refluxed for 8 hours, the mixture was concentrated under reduced pressure. The resultant reaction product was purified by silica gel chromatography (50% EtOAc/Hexane), whereby 10,11-bis(phenylsulfonyl)-4,4-dimethyl-3,5-dioxa-tricyclo[5.2.2.02.6]undec-8-ene was obtained (2.0 g, 98%). containing the mixture After having been refluxed for 8 hours the mixture was concentrated under reduced pressure The resultant reaction product was purified by silica gel chromatography (50% EtOAc/Hexane)

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

Procedure: The compound obtained in Step (11) was placed in a reaction vessel, and air in the vessel was replaced with nitrogen. After that, the compound was dissolved in dehydrated toluene (116 ml). Distilled DBU (6.0 ml, 40.1 mmol) was added to the solution, and the mixture was refluxed for 6 hours. After the reaction product had been filtrated, sodium hydrogen carbonate was added to the filtrate, and the organic layer was dried over magnesium sulfate, whereby 2,2-dimethyl-3a,7a-dihydrobenzo[1.3]dioxol was obtained. The compound was used in the next reaction without being further purified. the mixture was refluxed for 6 hours After the reaction product had been filtrated sodium hydrogen carbonate was added to the filtrate the organic layer was dried over magnesium sulfate

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

Procedure: Trans-1,2-bis(phenylsulfonyl)ethylene (1.37 g, 4.45 mmol) was added to a solution of the compound obtained in Step (12) in toluene, and air in a vessel containing the mixture was replaced with nitrogen. After having been refluxed for 8 hours, the mixture was concentrated under reduced pressure. The resultant reaction product was purified by silica gel chromatography (50% EtOAc/Hexane), whereby 10,11-bis(phenylsulfonyl)-4,4-dimethyl-3,5-dioxa-tricyclo[5.2.2.02.6]undec-8-ene was obtained (2.0 g, 98%). containing the mixture After having been refluxed for 8 hours the mixture was concentrated under reduced pressure The resultant reaction product was purified by silica gel chromatography (50% EtOAc/Hexane)

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

Procedure: The compound obtained in Step (11) was placed in a reaction vessel, and air in the vessel was replaced with nitrogen. After that, the compound was dissolved in dehydrated toluene (116 ml). Distilled DBU (6.0 ml, 40.1 mmol) was added to the solution, and the mixture was refluxed for 6 hours. After the reaction product had been filtrated, sodium hydrogen carbonate was added to the filtrate, and the organic layer was dried over magnesium sulfate, whereby 2,2-dimethyl-3a,7a-dihydrobenzo[1.3]dioxol was obtained. The compound was used in the next reaction without being further purified. the mixture was refluxed for 6 hours After the reaction product had been filtrated sodium hydrogen carbonate was added to the filtrate the organic layer was dried over magnesium sulfate