5-(1,3-dioxolan-2-ylmethyl)-3H-2-benzofuran-1-one

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

Procedure: 5-(1,3-Dioxolan-2-ylmethyl)-2-benzofuran-1(3H)-one (61 g, 280 mmol) was combined with water (2.2 L) in a 5 L round bottomed flask equipped with a Claisen adapter, thermocouple, stir bar and nitrogen bubbler. Aqueous HCl solution (2M, 1.14 L, 2.29 mol) was added and the resulting mixture was heated at 40° C. for 8 h. Then the mixture was stirred overnight at room temperature. The mixture was extracted three times with 2 L of ethyl acetate. The combined organic layers were concentrated to give (1-oxo-1,3-dihydro-2-benzofuran-5-yl)acetaldehyde. MS: in/z 177 (M+1)+. equipped with a Claisen adapter Then the mixture was stirred overnight at room temperature The mixture was extracted three times with 2 L of ethyl acetate The combined organic layers were concentrated

Conditions: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A three-neck 5 L round bottomed flask equipped with a stir bar, firestone valve, thermocouple, condenser and heating mantle was charged with tri-t-butyl phosphonium tetrafluoroborate (500 mg, 1.72 mmol), palladium (II) acetate (250 mg, 1.1 mmol) and 5-bromo-2-benzofuran-1(3H)-one (100 g, 469 mmol). DMF (1.88 L) was added to the flask, and the mixture was degassed three times by alternating vacuum and nitrogen purge. Commercially available bromo(1,3-dioxolan-2-ylmethyl)zinc solution (1.033 L, 516 mmol) was added via canula and the mixture was again degassed three times. The mixture was then heated at 85° C. for 5 h. Analysis by HPLC-MS indicated the reaction was not complete. The mixture was stirred at 85° C. for 5 more h. The mixture was then allowed to return to room temperature for overnight. 2-methylTHF (2 L) and brine were added, and the mixture was stirred for 5 min. The layers were separated and the aqueous layer was extracted again with 2-methylTHF. The organic layers were combined, washed three times with brine (4 L each), dried over MgSO4, filtered, and concentrated. The crude product was purified by flash chromatography (1.5 kg silica cartridge), eluting with 0-20% ethyl acetate in dichloromethane to afford 5-(1,3-dioxolan-2-ylmethyl)-2-benzofuran-1(3H)-one, MS: m/z 221 (M+1)+. A three-neck 5 L round bottomed flask equipped with a stir bar, firestone valve thermocouple, condenser and heating mantle the mixture was degassed three times purge the mixture was again degassed three times 2-methylTHF (2 L) and brine were added the mixture was stirred for 5 min The layers were separated the aqueous layer was extracted again with 2-methylTHF washed three times with brine (4 L each) dried over MgSO4 filtered concentrated The crude product was purified by flash chromatography (1.5 kg silica cartridge) eluting with 0-20% ethyl acetate in dichloromethane

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

Procedure: 5-(1,3-Dioxolan-2-ylmethyl)-2-benzofuran-1(3H)-one (61 g, 280 mmol) was combined with water (2.2 L) in a 5 L round bottomed flask equipped with a Claisen adapter, thermocouple, stir bar and nitrogen bubbler. Aqueous HCl solution (2M, 1.14 L, 2.29 mol) was added and the resulting mixture was heated at 40° C. for 8 h. Then the mixture was stirred overnight at room temperature. The mixture was extracted three times with 2 L of ethyl acetate. The combined organic layers were concentrated to give (1-oxo-1,3-dihydro-2-benzofuran-5-yl)acetaldehyde. LC-MS (IE, m/z): 177 (M+1)+. equipped with a Claisen adapter Then the mixture was stirred overnight at room temperature The mixture was extracted three times with 2 L of ethyl acetate The combined organic layers were concentrated

Conditions: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A three-neck 5 L round bottomed flask equipped with a stir bar, firestone valve, thermocouple, condenser and heating mantle was charged with tri-t-butyl phosphonium tetrafluoroborate (500 mg, 1.72 mmol), palladium (II) acetate (250 mg, 1.1 mmol) and 5-bromo-2-benzofuran-1(3H)-one (100 g, 470 mmol). DMF (1.88 L) was added to the flask, and the mixture was degassed three times by alternating vacuum and nitrogen purge. Commercially available bromo(1,3-dioxolan-2-ylmethyl)zinc solution (1.03 L, 516 mmol) was added via canula and the mixture was again degassed three times. The mixture was then heated at 85° C. for 5 h. Analysis by HPLC-MS indicated the reaction was not complete. The mixture was stirred at 85° C. for 5 more h. The mixture was then allowed to return to room temperature for overnight. 2-methylTHF (2 L) and brine were added, and the mixture was stirred for 5 min. The layers were separated and the aqueous layer was extracted again with 2-methylTHF. The organic layers were combined, washed three times with brine (4 L each), dried over MgSO4, filtered, and concentrated. The crude product was purified by flash chromatography (1.5 kg silica cartridge), eluting with 0-20% ethyl acetate in dichloromethane to afford 5-(1,3-dioxolan-2-ylmethyl)-2-benzofuran-1(3H)-one. LC-MS (IE, m/z): 221 [M+1]+. A three-neck 5 L round bottomed flask equipped with a stir bar, firestone valve thermocouple, condenser and heating mantle the mixture was degassed three times purge the mixture was again degassed three times 2-methylTHF (2 L) and brine were added the mixture was stirred for 5 min The layers were separated the aqueous layer was extracted again with 2-methylTHF washed three times with brine (4 L each) dried over MgSO4 filtered concentrated The crude product was purified by flash chromatography (1.5 kg silica cartridge) eluting with 0-20% ethyl acetate in dichloromethane

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

Procedure: 5-(1,3-Dioxolan-2-ylmethyl)-2-benzofuran-1(3H)-one (61 g, 280 mmol) was combined with water (2.2 L) in a 5 L round bottomed flask equipped with a Claisen adapter, thermocouple, stir bar and nitrogen bubbler. Aqueous HCl solution (2M, 1.14 L, 2.29 mol) was added and the resulting mixture was heated at 40° C. for 8 h. Then the mixture was stirred overnight at room temperature. The mixture was extracted three times with 2 L of ethyl acetate. The combined organic layers were concentrated to give (1-oxo-1,3-dihydro-2-benzofuran-5-yl)acetaldehyde. LC-MS (IE, m/z): 177 (M+1)+. equipped with a Claisen adapter Then the mixture was stirred overnight at room temperature The mixture was extracted three times with 2 L of ethyl acetate The combined organic layers were concentrated

Conditions: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A three-neck 5 L round bottomed flask equipped with a stir bar, firestone valve, thermocouple, condenser and heating mantle was charged with tri-t-butyl phosphonium tetrafluoroborate (500 mg, 1.72 mmol), palladium (II) acetate (250 mg, 1.1 mmol) and 5-bromo-2-benzofuran-1(3H)-one (100 g, 470 mmol). DMF (1.88 L) was added to the flask, and the mixture was degassed three times by alternating vacuum and nitrogen purge. Commercially available bromo(1,3-dioxolan-2-ylmethyl)zinc solution (1.03 L, 516 mmol) was added via canula and the mixture was again degassed three times. The mixture was then heated at 85° C. for 5 h. Analysis by HPLC-MS indicated the reaction was not complete. The mixture was stirred at 85° C. for 5 more h. The mixture was then allowed to return to room temperature for overnight. 2-methylTHF (2 L) and brine were added, and the mixture was stirred for 5 min. The layers were separated and the aqueous layer was extracted again with 2-methylTHF. The organic layers were combined, washed three times with brine (4 L each), dried over MgSO4, filtered, and concentrated. The crude product was purified by flash chromatography (1.5 kg silica cartridge), eluting with 0-20% ethyl acetate in dichlromethane to afford 5-(1,3-dioxolan-2-ylmethyl)-2-benzofuran-1(3H)-one. LC-MS (IE, m/z): 221 [M+1]+. A three-neck 5 L round bottomed flask equipped with a stir bar, firestone valve thermocouple, condenser and heating mantle the mixture was degassed three times purge the mixture was again degassed three times 2-methylTHF (2 L) and brine were added the mixture was stirred for 5 min The layers were separated the aqueous layer was extracted again with 2-methylTHF washed three times with brine (4 L each) dried over MgSO4 filtered concentrated The crude product was purified by flash chromatography (1.5 kg silica cartridge) eluting with 0-20% ethyl acetate in dichlromethane

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

Procedure: 5-(1,3-Dioxolan-2-ylmethyl)-2-benzofuran-1(3H)-one (61 g, 280 mmol) was combined with water (2.2 L) in a 5 L round bottomed flask equipped with a Claisen adapter, thermocouple, stir bar and nitrogen bubbler. Aqueous HCl solution (2M, 1.14 L, 2.29 mol) was added and the resulting mixture was heated at 40° C. for 8 h. Then the mixture was stirred overnight at room temperature. The mixture was extracted three times with 2 L of ethyl acetate. The combined organic layers were concentrated to give (1-oxo-1,3-dihydro-2-benzofuran-5-yl)acetaldehyde. LC-MS (IE, m/z): 177 (M+1)+. equipped with a Claisen adapter Then the mixture was stirred overnight at room temperature The mixture was extracted three times with 2 L of ethyl acetate The combined organic layers were concentrated

Conditions: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A three-neck 5 L round bottomed flask equipped with a stir bar, firestone valve, thermocouple, condenser and heating mantle was charged with tri-t-butyl phosphonium tetrafluoroborate (500 mg, 1.72 mmol), palladium (II) acetate (250 mg, 1.1 mmol) and 5-bromo-2-benzofuran-1(3H)-one (100 g, 470 mmol). DMF (1.88 L) was added to the flask, and the mixture was degassed three times by alternating vacuum and nitrogen purge. Commercially available bromo(1,3-dioxolan-2-ylmethyl)zinc solution (1.03 L, 516 mmol) was added via canula and the mixture was again degassed three times. The mixture was then heated at 85° C. for 5 h. Analysis by HPLC-MS indicated the reaction was not complete. The mixture was stirred at 85° C. for 5 more h. The mixture was then allowed to return to room temperature for overnight. 2-methylTHF (2 L) and brine were added, and the mixture was stirred for 5 min. The layers were separated and the aqueous layer was extracted again with 2-methylTHF. The organic layers were combined, washed three times with brine (4 L each), dried over MgSO4, filtered, and concentrated. The crude product was purified by flash chromatography (1.5 kg silica cartridge), eluting with 0-20% ethyl acetate in dichloromethane to afford 5-(1,3-dioxolan-2-ylmethyl)-2-benzofuran-1(3H)-one. LC-MS (IE, m/z): 221 [M+1]+. A three-neck 5 L round bottomed flask equipped with a stir bar, firestone valve thermocouple, condenser and heating mantle the mixture was degassed three times purge the mixture was again degassed three times 2-methylTHF (2 L) and brine were added the mixture was stirred for 5 min The layers were separated the aqueous layer was extracted again with 2-methylTHF washed three times with brine (4 L each) dried over MgSO4 filtered concentrated The crude product was purified by flash chromatography (1.5 kg silica cartridge) eluting with 0-20% ethyl acetate in dichloromethane

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

Procedure: 5-(1,3-Dioxolan-2-ylmethyl)-2-benzofuran-1(3H)-one (61 g, 280 mmol) was combined with water (2.2 L) in a 5 L round bottomed flask equipped with a Claisen adapter, thermocouple, stir bar and nitrogen bubbler. Aqueous HCl solution (2M, 1.14 L, 2.29 mol) was added and the resulting mixture was heated at 40° C. for 8 h. Then the mixture was stirred overnight at room temperature. The mixture was extracted three times with 2 L of ethyl acetate. The combined organic layers were concentrated to give (1-oxo-1,3-dihydro-2-benzofuran-5-yl)acetaldehyde. MS: m/z 177 (M+1)+. equipped with a Claisen adapter Then the mixture was stirred overnight at room temperature The mixture was extracted three times with 2 L of ethyl acetate The combined organic layers were concentrated

Conditions: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A three-neck 5 L round bottomed flask equipped with a stir bar, firestone valve, thermocouple, condenser and heating mantle was charged with tri-t-butyl phosphonium tetrafluoroborate (500 mg, 1.72 mmol), palladium (II) acetate (250 mg, 1.1 mmol) and 5-bromo-2-benzofuran-1(3H)-one (100 g, 469 mmol). DMF (1.88 L) was added to the flask, and the mixture was degassed three times by alternating vacuum and nitrogen purge. Commercially available bromo(1,3-dioxolan-2-ylmethyl)zinc solution (1.033 L, 516 mmol) was added via canula and the mixture was again degassed three times. The mixture was then heated at 85° C. for 5 h. Analysis by HPLC-MS indicated the reaction was not complete. The mixture was stirred at 85° C. for 5 more h. The mixture was then allowed to return to room temperature for overnight. 2-methylTHF (2 L) and brine were added, and the mixture was stirred for 5 min. The layers were separated and the aqueous layer was extracted again with 2-methylTHF. The organic layers were combined, washed three times with brine (4 L each), dried over MgSO4, filtered, and concentrated. The crude product was purified by flash chromatography (1.5 kg silica cartridge), eluting with 0-20% ethyl acetate in dichlromethane to afford 5-(1,3-dioxolan-2-ylmethyl)-2-benzofuran-1(3H)-one. MS: m/z 221 (M+1)+. A three-neck 5 L round bottomed flask equipped with a stir bar, firestone valve thermocouple, condenser and heating mantle the mixture was degassed three times purge the mixture was again degassed three times 2-methylTHF (2 L) and brine were added the mixture was stirred for 5 min The layers were separated the aqueous layer was extracted again with 2-methylTHF washed three times with brine (4 L each) dried over MgSO4 filtered concentrated The crude product was purified by flash chromatography (1.5 kg silica cartridge) eluting with 0-20% ethyl acetate in dichlromethane

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

Procedure: 5-(1,3-Dioxolan-2-ylmethyl)-2-benzofuran-1(3H)-one (61 g, 280 mmol) was combined with water (2.2 L) in a 5 L round bottomed flask equipped with a Claisen adapter, thermocouple, stir bar and nitrogen bubbler. Aqueous HCl solution (2M, 1.14 L, 2.29 mol) was added and the resulting mixture was heated at 40° C. for 8 h. Then the mixture was stirred overnight at room temperature. The mixture was extracted three times with 2 L of ethyl acetate. The combined organic layers were concentrated to give (1-oxo-1,3-dihydro-2-benzofuran-5-yl)acetaldehyde. LC-MS (IE, m/z): 177 (M+1)+. equipped with a Claisen adapter Then the mixture was stirred overnight at room temperature The mixture was extracted three times with 2 L of ethyl acetate The combined organic layers were concentrated

Conditions: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A three-neck 5 L round bottomed flask equipped with a stir bar, firestone valve, thermocouple, condenser and heating mantle was charged with tri-t-butyl phosphonium tetrafluoroborate (500 mg, 1.72 mmol), palladium (II) acetate (250 mg, 1.1 mmol) and 5-bromo-2-benzofuran-1(3H)-one (100 g, 470 mmol). DMF (1.88 L) was added to the flask, and the mixture was degassed three times by alternating vacuum and nitrogen purge. Commercially available bromo(1,3-dioxolan-2-ylmethyl)zinc solution (1.03 L, 516 mmol) was added via canula and the mixture was again degassed three times. The mixture was then heated at 85° C. for 5 hours, checked by HPLC-MS, then stirred at 85° C. for 5 more hours. The mixture was then allowed to return to RT for overnight. 2-MethylTHF (2 L) and brine were added, and the mixture was stirred for 5 min. The layers were separated and the aqueous layer was extracted again with 2-methylTHF. The organic layers were combined, washed three times with brine (4 L each), dried over MgSO4, filtered and concentrated. The crude product was purified by flash chromatography (1.5 kg silica cartridge), eluting with 0-20% ethyl acetate in DCM to afford the title compound. LC-MS (IE, m/z): 221 [M+1]+. A three-neck 5 L round bottomed flask equipped with a stir bar, firestone valve thermocouple, condenser and heating mantle the mixture was degassed three times purge the mixture was again degassed three times 2-MethylTHF (2 L) and brine were added the mixture was stirred for 5 min The layers were separated the aqueous layer was extracted again with 2-methylTHF washed three times with brine (4 L each) dried over MgSO4 filtered concentrated The crude product was purified by flash chromatography (1.5 kg silica cartridge) eluting with 0-20% ethyl acetate in DCM