2-(iodomethyl)-2,3-dihydro-1-benzofuran

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

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

Procedure: 5.1 g of N-piperid-4-yl-N-methylpropionamide acetate, 90 ml of dimethylformamide and 6.3 ml of triethylamine are introduced into a 250 ml three-necked flask. 6.6 g of 2,3-dihydro-2-iodomethylbenzofuran are poured onto the mixture which is heated to 60°-65° C. This temperature is maintained for 15 hours. The reaction mixture is evaporated to dryness and the residue is taken up in ethyl acetate and extracted with 150 ml of N hydrochloric acid. The aqueous phase is rendered alkaline with sodium hydroxide in the presence of ethyl acetate. The organic phase is washed with water and dried over magnesium sulphate. The solvent is evaporated to yield a base in the form of a brown oil, which is converted into a salt with 3.8N ethereal hydrogen chloride to yield the desired compound. is heated to 60°-65° C This temperature is maintained for 15 hours The reaction mixture is evaporated to dryness extracted with 150 ml of N hydrochloric acid The organic phase is washed with water dried over magnesium sulphate The solvent is evaporated to yield a base in the form of a brown oil, which

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

Procedure: To a solution of 2-(iodomethyl)-2,3-dihydro-1-benzofuran (5.3 g, 20.4 mmol) in acetonitrile (70 ml) was added potassium carbonate (5.6 g, 40.5 mmol, 2 eq) and piperazine (8.8 g, 102.2 mmol, 5 eq). The resulting mixture was heated at reflux for 2 hours. The solids were then filtered off and the filtrate was concentrated under vacuum. The crude material was purified by silica gel chromatography using 0.5-2.5% methanol in dichloromethane to elute. The product-containing fractions were combined and concentrated under vacuum to afford 1-(2,3-dihydro-1-benzofuran-2-ylmethyl)piperazine as brown oil (2.4 g, 54%); (ES, m/z): [M+H]+ 219; 1H NMR (300 MHz, CDCl3): δ 7.07-7.17 (m, 2H), 6.78-6.85 (m, 2H), 4.92-5.01 (m, 1H), 3.22 (dd, J=9.0 Hz, 15.6 Hz, 1H), 2.91-2.99 (m, 4H), 2.71-2.82 (m, 1H), 2.53-2.71 (m, 6H). The resulting mixture was heated at reflux for 2 hours The solids were then filtered off the filtrate was concentrated under vacuum The crude material was purified by silica gel chromatography to elute concentrated under vacuum

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

Procedure: To a solution of 2-allylphenol (10 g, 75 mmol) in dichloromethane (150 ml) was added SnCl4 (29.7 g, 37.3 mmol, 0.5 eq) and iodine (19 g, 75 mmol, 1 eq) at room temperature. After stirring for 5.5 hours, the reaction mixture was diluted with additional dichloromethane (200 ml) and then quenched with water (200 ml). The organic layer was separated and the aqueous layer was adjusted pH to ˜8 with sodium bicarbonate and then extracted with dichloromethane (3×150 ml). The organic layers were combined, washed with 5% aqueous Na2S2O4 (200 ml), dried over anhydrous magnesium sulfate, filtered, and then concentrated under vacuum. The crude material was purified by silica gel chromatography using with 0.5-1% ethyl acetate in petroleum ether to elute. The product-containing fractions were combined and concentrated to afford 2-(iodomethyl)-2,3-dihydro-1-benzofuran as brown oil (7 g, 36%); 1H NMR (300 MHz, CDCl3): δ 7.09-7.17 (m, 2H), 6.74-6.89 (m, 2H), 4.84-4.93 (m, 1H), 3.30-3.47 (m, 3H), 3.00-3.08 (m, 1H). quenched with water (200 ml) The organic layer was separated extracted with dichloromethane (3×150 ml) washed with 5% aqueous Na2S2O4 (200 ml) dried over anhydrous magnesium sulfate filtered concentrated under vacuum The crude material was purified by silica gel chromatography to elute concentrated