chloromethylsulfonylbenzene

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

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

Conditions: temp:-30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of nitrobenzene (3.08 g, 25.0 mmol) and chloromethylphenylsulfone (4.76 g, 25.0 mmol) in dry THF is cooled to −50° C. and treated with 1.0M KOtBu/THF (55.0 mL, 55.0 mmol). The reaction is allowed to warm to −30° C. over 1 h, treated with glacial acetic acid (3.6 mL), warmed to 20° C., treated with water and extracted with CH2Cl2. The combined extracts are dried over MgSO4 and concentrated in vacuo. Chromatography (1:1 ethyl acetate:hexanes) of the resultant residue give the title product as a white solid, 5.62 g, (81% yield), mp 106–108° C., identified by mass spectral and HNMR analyses. warmed to 20° C. extracted with CH2Cl2 The combined extracts are dried over MgSO4 concentrated in vacuo

Conditions: temp:-10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A stirred solution of 1-methyl-4-(5-nitropyridin-2-yl)piperazine (1.10 g, 5.00 mmol) and chloromethylphenylsulfone (0.950 g, 5.00 mmol) in dry THF, under nitrogen, is cooled to −60° C., treated with 1.0 M KOtBu in THF (10.0 mL, 10.0 mmol), allowed to warm to −10° C. over a 1 h period, quenched with acetic acid, treated sequentially with water and saturated aqueous NaHCO3 and extracted with CH2Cl2. The combined extracts are washed sequentially with water and brine, dried over MgSO4 and concentrated in vacuo. The resultant residue is crystallized from EtOAc to give the title compound as a yellow solid, 1.60 g (85% yield), mp: 170°-172° C., identified by mass spectral and NMR analyses. quenched with acetic acid treated sequentially with water and saturated aqueous NaHCO3 extracted with CH2Cl2 The combined extracts are washed sequentially with water and brine dried over MgSO4 concentrated in vacuo The resultant residue is crystallized from EtOAc

Conditions: temp:-30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of nitrobenzene (3.08 g, 25.0 mmol) and chloromethylphenylsulfone (4.76 g, 25.0 mmol) in dry THF is cooled to −50° C. and treated with 1.0M KOtBu/THF (55.0 mL, 55.0 mmol). The reaction is allowed to warm to −30° C. over 1 h, treated with glacial acetic acid (3.6 mL), warmed to 20° C., treated with water and extracted with CH2Cl2. The combined extracts are dried over MgSO4 and concentrated in vacuo. Chromatography (1:1 ethyl acetate:hexanes) of the resultant residue give the title product as a white solid, 5.62 g, (81% yield), mp 106-108° C., identified by mass spectral and HNMR analyses. warmed to 20° C. extracted with CH2Cl2 The combined extracts are dried over MgSO4 concentrated in vacuo

Conditions: temp:-30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of nitrobenzene (3.08 g, 25.0 mmol) and chloromethylphenylsulfone (4.76 g, 25.0 mmol) in dry THF is cooled to −50° C. and treated with 1.0M KOtBu/THF (55.0 mL, 55.0 mmol). The reaction is allowed to warm to −30° C. over 1 h, treated with glacial acetic acid (3.6 mL), warmed to 20° C., treated with water and extracted with CH2Cl2. The combined extracts are dried over MgSO4 and concentrated in vacuo. Chromatography (1:1 ethyl acetate:hexanes) of the resultant residue give the title product as a white solid, 5.62 g, (81% yield), mp 106-108° C., identified by mass spectral and HNMR analyses. warmed to 20° C. extracted with CH2Cl2 The combined extracts are dried over MgSO4 concentrated in vacuo

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

Procedure: A 1 M KOt-Bu solution in tetrahydrofuran (50 mL, 50 mmol) is cooled to −40° C., treated portion-wise with a solution of chloromethyl phenyl sulfone (4.39 g, 23.0 mmol) and then with a solution of 2-methoxy-5-nitropyridine (3.55 g, 23.0 mmol) in tetrahydrofuran, stirred for 45 min at −40° C., treated with glacial acetic acid (3.0 g, 50 mmol) and filtered. The filtercake is air-dried to give the title compound as a tan solid, 5.70 g (80% yield), mp 147-149° C., identified by mass spectral and HNMR analyses. filtered The filtercake is air-dried

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

Procedure: Adapting the procedure of Makosza, et al, Liebigs Ann. Chem., 1984, 8-14, a stirred mixture of 4-nitro-pyridine-N-oxide (1.40 g, 10.0 mmol) and chloromethylphenylsulfone (1.92 g, 10.0 mmol) in DMSO (25 mL) in a cold water bath is treated with a solution of KOH (4.0 g, 71 mmol) in DMSO, stirred for 45 min, poured into 1.0 M hydrochloric acid and water and extracted with CH2Cl2. The aqueous phase is filtered and the filtercake is dried in vacuo to afford the title compound, 1.20 g (41% yield). The organic extracts are combined, dried over MgSO4 and concentrated in vacuo. The resultant wet solid is heated in boiling ethanol:water (4:1) and filtered. The filtrate is cooled, concentrated and filtered. This filtercake is dried in vacuo to afford an additional portion of the title compound, 0.967 g (74% total yield), mp 219-220° C., identified by mass spectral and HNMR analyses. extracted with CH2Cl2 The aqueous phase is filtered the filtercake is dried in vacuo

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

Procedure: Adapting the procedure of Makosza, et al, Liebigs Ann. Chem., 1984, 8-14, a stirred mixture of 4-nitro-pyridine-N-oxide (1.40 g, 10.0 mmol) and chloromethylphenylsulfone (1.92 g, 10.0 mmol) in DMSO (25 mL) in a cold water bath is treated with a solution of KOH (4.0 g, 71 mmol) in DMSO, stirred for 45 min, poured into 1.0 M hydrochloric acid and water and extracted with CH2Cl2. The aqueous phase is filtered and the filtercake is dried in vacuo to afford the title compound, 1.20 g (41% yield). The organic extracts are combined, dried over MgSO4 and concentrated in vacuo. The resultant wet solid is heated in boiling ethanol:water (4:1) and filtered. The filtrate is cooled, concentrated and filtered. This filtercake is dried in vacuo to afford an additional portion of the title compound, 0.967 g (74% total yield), mp 219-220° C., identified by mass spectral and HNMR analyses. extracted with CH2Cl2 The aqueous phase is filtered the filtercake is dried in vacuo

Conditions: temp:-20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A stirred solution of 1-benzyl-4-(4-nitrophenyl)piperazine (5.95 g, 20.0 mmol) and chloromethylphenylsulfone (3.82 g, 20.0 mmol) in dry THF under nitrogen at −60° C. is treated with 1.0M KO-t-Bu in THF (44.0 mL, 44.0 mmol), warmed to −20° C. over a 1 h period, quenched with acetic acid and treated sequentially with water, saturated aqueous NaHCO3 and ether. The phases are separated and the aqueous phase is extracted with ether. The combined ethers are washed with water and brine, dried over MgSO4 and concentrated in vacuo. The resultant residue is chromatographed (silica gel, 1:1 and 1:0 ethyl acetate:hexanes as eluent) to give the title compound as a yellow solid, 7.52 g (83% yield), mp 145-146° C., characterized by NMR and mass spectral analyses. quenched with acetic acid treated sequentially with water, saturated aqueous NaHCO3 and ether The phases are separated the aqueous phase is extracted with ether The combined ethers are washed with water and brine dried over MgSO4 concentrated in vacuo The resultant residue is chromatographed (silica gel, 1:1 and 1:0 ethyl acetate:hexanes as eluent)

Conditions: temp:-20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A stirred solution of 1-benzyl-4-(4-nitrophenyl)piperazine (5.95 g, 20.0 mmol) and chloromethylphenylsulfone (3.82 g, 20.0 mmol) in dry THF under nitrogen at −60° C. is treated with 1.0M KO-t-Bu in THF (44.0 mL, 44.0 mmol), warmed to −20° C. over a 1 h period, quenched with acetic acid and treated sequentially with water, saturated aqueous NaHCO3 and ether. The phases are separated and the aqueous phase is extracted with ether. The combined ethers are washed with water and brine, dried over MgSO4 and concentrated in vacuo. The resultant residue is chromatographed (silica gel, 1:1 and 1:0 ethyl acetate:hexanes as eluent) to give the title compound as a yellow solid, 7.52 g (83% yield), mp 145-146° C., characterized by NMR and mass spectral analyses. quenched with acetic acid treated sequentially with water, saturated aqueous NaHCO3 and ether The phases are separated the aqueous phase is extracted with ether The combined ethers are washed with water and brine dried over MgSO4 concentrated in vacuo The resultant residue is chromatographed (silica gel, 1:1 and 1:0 ethyl acetate:hexanes as eluent)

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