1,3-二噻烷-2-甲酸乙酯

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a suspension of NaH (95%, 2.8 g, 111 mmol) in dry toluene (120 mL) stirring at 0° C. was dropwise added, over 10 minutes, a solution of bromomethylcyclopropane (15 g, 111 mmol), and ethyl 1,3-dithiane-2-carboxylate (17.77 g, 92.58 mmol) in dry DMF (40 mL). The ice bath was removed and the solution was stirred overnight at rt. Water was added to the solution and the phases were separated. The organic phase was dried over MgSO4, then evaporated to give 19.6 g (50%) of ethyl 2-(cyclopropylmethyl)-1,3-dithiane-2-carboxylate, which was used in the next step without purification. 1H NMR (CDCl3): δ 4.26 (2H, q, J=7.2 Hz), 3.30-3.23 (2H, m), 2.69-2.64 (2H, m), 2.16-2.11 (1H, m), 1.96 (2H, d, J=6.8 Hz), 1.91-1.81 (1H, m), 1.34 (3H, t, J=7.2 Hz), 0.93-0.86 (1H, m), 0.52-0.47 (2H, m), 0.20-0.16 (2H, m). was dropwise added, over 10 minutes The ice bath was removed the solution was stirred overnight at rt Water was added to the solution the phases were separated The organic phase was dried over MgSO4 evaporated

反应条件: temp:-25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 3.0 g (15.6 mmol) of 2-ethoxycarbonyl-1,3-dithiane in 40 ml of dry tetrahydrofuran was cooled under inert atmosphere to -78° C. and treated with 7.5 ml (15.6 mmol) of n-butyllithium. The resulting solution was warmed to -25° C., stirred for 20 min, recooled to -78° C., treated with 1.8 ml (15.6 mmol) of benzyl chloride, and stirred at ambient temperature for 16 h. After quenching with aqueous ammonium chloride, the mixture was extracted with ether, washed sequentially with water, aqueous sodium thiosulfate, and brine, dried over MgSO4, and concentrated in vacuo. Flash chromatography using 5% ethyl acetate in hexane gave 3.9 g (88%) of the desired compound. 1H NMR (CDCl3) δ 1.33 (t, J=7 Hz, 3H), 1.85 (qt, J=14, 3 Hz, 1H), 2.11 (dm, J=14 Hz, 1H), 2.69 (dt, J=14, 4 Hz, 2H), 3.23 (ddd, J=14, 12, 3 Hz, 2H), 3.38 (s, 2H), 4.27 (q, J=7 Hz, 2H), 7.25-7.35 (m, 5H). Mass spectrum (M+NH4)+ =300. recooled to -78° C. stirred at ambient temperature for 16 h After quenching with aqueous ammonium chloride the mixture was extracted with ether washed sequentially with water, aqueous sodium thiosulfate, and brine dried over MgSO4 concentrated in vacuo

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 3-[2,3-Dihydro-2-benzofuranyl)propyl]-1,3-dithiane-2-carboxylic acid ethyl ester (8.0 g) dissolved in acetonitrile (15 mls) was added rapidly to a stirred solution of N-chlorosuccinimide (120 g) and silver nitrate (17.6 g) in 80% acetonitrile-water at 25° C. After 10 minutes saturated solutions of sodium sulphite (50 mls), sodium carbonate (50 mls) and brine were added successively at one minute intervals. To this mixture, a solution of hexane-dichloromethane (1:1, 250 mls) was added followed by filtration through celite. The organic phase of the filtrate was separated and dried over anhydrous magnesium sulphate. Removal of the solvent gave an oil (5.0 g). The unstable product was used immediately in the next stage. M/e M+ 262. followed by filtration through celite The organic phase of the filtrate was separated dried over anhydrous magnesium sulphate Removal of the solvent

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 3-[2,3-Dihydro-2-benzofuranyl)propyl]-1,3-dithiane-2-carboxylic acid ethyl ester (8.0 g) dissolved in acetonitrile (15 mls) was added rapidly to a stirred solution of N-chlorosuccinimide (120 g) and silver nitrate (17.6 g) in 80% acetonitrile-water at 25° C. After 10 minutes saturated solutions of sodium sulphite (50 mls), sodium carbonate (50 mls) and brine were added successively at one minute intervals. To this mixture, a solution of hexane-dichloromethane (1:1, 250 mls) was added followed by filtration through celite. The organic phase of the filtrate was separated and dried over anhydrous magnesium sulphate. Removal of the solvent gave an oil (5.0 g). The unstable product was used immediately in the next stage. M/e M+ 262. followed by filtration through celite The organic phase of the filtrate was separated dried over anhydrous magnesium sulphate Removal of the solvent

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a flamed dried flask is added dry toluene (80 mL) and sodium hydride (60%, 33.5 mmol, 1.34 g). The reaction is cooled in a ice bath and a solution of ethyl 1,3 dithiane carboxylate (52 mmol, 10 g) and bromomethyl cyclopropane (62.4 mmol, 8.42 g) in DMF (24 mL) are added dropwise over 10 min. The ice bath is removed and the reaction is stirred for 18 h. Water is added (50 mL) and the organic layer is separated. The organic layer is washed with brine, dried (Na2SO4), and concentrated to a yellow oil (12 g, 92%). LC-MS: 247.0 (M+1). To a flamed dried flask The reaction is cooled in a ice bath The ice bath is removed Water is added (50 mL) the organic layer is separated The organic layer is washed with brine dried (Na2SO4) concentrated to a yellow oil (12 g, 92%)

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a flamed dried flask is added dry toluene (80 mL) and sodium hydride (60%, 33.5 mmol, 1.34 g). The reaction is cooled in a ice bath and a solution of ethyl 1,3 dithiane carboxylate (52 mmol, 10 g) and bromomethyl cyclopropane (62.4 mmol, 8.42 g) in DMF (24 mL) are added dropwise over 10 min. The ice bath is removed and the reaction is stirred for 18 h. Water is added (50 mL) and the organic layer is separated. The organic layer is washed with brine, dried (Na2SO4), and concentrated to a yellow oil (12 g, 92%). LC-MS: 247.0 (M+1). To a flamed dried flask The reaction is cooled in a ice bath The ice bath is removed Water is added (50 mL) the organic layer is separated The organic layer is washed with brine dried (Na2SO4) concentrated to a yellow oil (12 g, 92%)