3-methylidene-2-benzofuran-1-one

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:

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

Procedure: By a method similar to the procedure of Example 2, a reaction of 2,4-dichlorobenzaldehyde chlorooxime and 3-methylenephthalide was carried out. The solid collected from the reaction mixture afforded 12.2 g of the desired product after workup, and the ether solution gave 4 g of the desired product (yield 70.2%). Recrystallization from chloroform led to pure white crystals of the desired product, m.p. 158°-161° C. The solid collected from the reaction mixture

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

Procedure: By a method similar to the procedure of Example 2, a reaction of 2,4-dichlorobenzaldehyde chlorooxime and 3-methylenephthalide was carried out. The solid collected from the reaction mixture afforded 12.2 g of the desired product after workup, and the ether solution gave 4 g of the desired product (yield 70.2%). Recrystallization from chloroform led to pure white crystals of the desired product, m.p. 158°-161° C. The solid collected from the reaction mixture

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

Procedure: To a solution of o-tolualdehyde chlorooxime (26.8 g, 0.158 mole), 3-methylenephthalide (14.6 g, 0.1 mole) and ether (400 ml.) was added dropwise a solution of triethylamine (16 g, 0.158 mole) in 30 ml. of ether at 5°-10° C. in 45 minutes. The mixture was stirred at room temperature for 40 hours and filtered. The solid material collected was dissolved in 1 liter of chloroform and 200 ml. of water. The chloroform solution was then washed two times with water, dried over CaSO4 and concentrated under vacuum to give 16.4 g of white solid, m.p. 146°-149° C. The original ether solution was washed two times with water, dried over CaSO4 and concentrated to 100 ml. Another 1.64 g of the spiro compound precipitated out. The ether solution was then further concentrated to 10.8 g of yellow-brown oil which did not contain a significant amount of the desired product. Recrystallization of 12 g of the crude spiro compound from tetrahydrofuran-ether gave 9.87 g of a pure white solid, m.p. 159°-164° C. with decomposition. filtered The solid material collected was dissolved in 1 liter of chloroform The chloroform solution was then washed two times with water dried over CaSO4 concentrated under vacuum

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

Procedure: To a solution of o-tolualdehyde chlorooxime (26.8 g, 0.158 mole), 3-methylenephthalide (14.6 g, 0.1 mole) and ether (400 ml.) was added dropwise a solution of triethylamine (16 g, 0.158 mole) in 30 ml. of ether at 5°-10° C. in 45 minutes. The mixture was stirred at room temperature for 40 hours and filtered. The solid material collected was dissolved in 1 liter of chloroform and 200 ml. of water. The chloroform solution was then washed two times with water, dried over CaSO4 and concentrated under vacuum to give 16.4 g of white solid, m.p. 146°-149° C. The original ether solution was washed two times with water, dried over CaSO4 and concentrated to 100 ml. Another 1.64 g of the spiro compound precipitated out. The ether solution was then further concentrated to 10.8 g of yellow-brown oil which did not contain a significant amount of the desired product. Recrystallization of 12 g of the crude spiro compound from tetrahydrofuran-ether gave 9.87 g of a pure white solid, m.p. 159°-164° C. with decomposition. filtered The solid material collected was dissolved in 1 liter of chloroform The chloroform solution was then washed two times with water dried over CaSO4 concentrated under vacuum

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

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

Procedure: To a solution of 109.5 g (0.75 mole) of 3-methylenephthalide and 285 g (1.27 mole) of m-trifluoromethylbenzaldehyde chlorooxime in 3.5 liters of ether was added 128.3 g (1.27 mole) of triethylamine in 250 ml. of ether at 0° C. during 3 hours. The solution was then stirred at room temperature overnight. An infrared spectrum indicated that the reaction was complete. The solid was filtered off. The ethereal solution was washed once with 10% HCl, twice with sodium chloride saturated water, dried over CaSO4 and concentrated under vacuum. Only 19.5 g of impure product was obtained. The solid material which was filtrated from the original reaction solution was stirred with 4 liters of tetrahydrofuran for 4 hours and filtered through a Buchner funnel. The tetrahydrofuran solution obtained was washed once with 10% HCl solution and twice with water saturated with sodium chloride. After being dried and concentrated, the tetrahydrofuran solution gave 140.6 g of pure product, m.p. 170° C. The solid was filtered off The ethereal solution was washed once with 10% HCl, twice with sodium chloride saturated water dried over CaSO4 concentrated under vacuum

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

Procedure: By a method similar to the procedure of Example 2, a reaction of 2,4-dichlorobenzaldehyde chlorooxime and 3-methylenephthalide was carried out. The solid collected from the reaction mixture afforded 12.2 g of the desired product after workup, and the ether solution gave 4 g of the desired product (yield 70.2%). Recrystallization from chloroform led to pure white crystals of the desired product, m.p. 158°-161° C. The solid collected from the reaction mixture