2-chlorosulfonylacetyl chloride

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 chlorosulfonylacetyl chloride (419 μL, 3.955 mmol, 1 eq.) in Et2O (4 mL), at 0° C. was added MeOH (160 μL, 3.955 mmol, 1 eq.). The reaction mixture is strirred at 0° C. for 3 h, then concentrated in vacuo to give chlorosulfonyl-acetic acid methyl ester. concentrated in vacuo

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

Procedure: To a solution of t-butanol (0.3 mL) in THF (3 mL) was added 2-chlorosulfonylacetyl chloride (0.1 mL, 1.0 mmol) at room temperature for 1 h. The volatiles were removed to provide the chlorosulfonyl-acetic acid tert-butyl ester (230 mg). The crude product was used without further purification. The volatiles were removed

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

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

Procedure: To a 0° C. solution of N-methylbenzothiohydrazide (10 mmol) in DCM (20 mL) and pyridine (1 mL) was added 2-(chlorosulfonyl)acetyl chloride (5 mmol) dropwise. The mixture was kept at rt for 2 h before it was poured into water (20 ml). The organic layer was separated, dried and evaporated and the resulting residue was purified by column chromatography to give compound 68 as yellowish solids (0.8 g). 1H-NMR (CDCl3) δ 10.5 (m, 1H), 7.4 (m, 10H), 4.4 (m, 1H), 3.4-3.8 (m, 8H) ppm; ESMS calcd for C18H20N4O3S3:436.1; found: 437.2 (M+H+). The organic layer was separated dried evaporated the resulting residue was purified by column chromatography

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

Procedure: To a solution of 2-(chlorosulfonyl)acetyl chloride (1 g, 5.65 mmol) in dry Et2O (5 ml) cooled to 0° C., a solution of methanol (0.286 g, 6.21 mmol) in dry Et2O (1 ml) was added dropwise. After 15 minutes, the mixture was warmed to RT and stirred for 2 hours. The solvent was evaporated and the desired compound was obtained (1 g, 5.36 mmol, 95% yield) and used in the next step without further purification. The solvent was evaporated

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of chlorosulfonylacetyl chloride (419 μL, 3.955 mmol, 1 eq.) in Et2O (4 mL), at 0° C. was added MeOH (160 μL, 3.955 mmol, 1 eq.). The reaction mixture is stirred at 0° C. for 3 h, then concentrated in vacuo to give chlorosulfonyl-acetic acid methyl ester. concentrated in vacuo

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

Procedure: 44 mg (0.25 mmol) 2-(chlorosulfonyl)acetyl chloride dissolved in 1 ml dry THF was treated with 42 mg (0.25 mmol) N-methylbenzothiohydrazide dissolved in 0.5 ml THF at 0° C. over 15 min. The reaction was stirred for 15 min and then checked by TLC if the thiohydrazide has completely reacted. Now 40 mg (0.25 mmol) N,N-diethyl-1-methylhydrazinecarbothioamide dissolved in 0.5 ml THF was added and the mixture stirred at 0° C. for 15 min. Then 60 μl (0.75 mmol) pyridine was added and the reaction allowed to warm up to r.t. overnight. The reaction was quenched with 5 ml water, the pH adjusted to 11 and extracted with 5 ml ethyl acetate. The pH was reduced to 4-5 and the aqueous phase extracted 2 times with 5 ml ethyl acetate. The latter extracts were dried over MgSO4 and concentrated. If the purity was not satisfactory (<90%) it was purified on silica with DCM/MeOH (5-20%)/NH4OH (1%). ESMS (C16H25N5O3S3): calc'd. 431.11. Found: 432.2 [M+H+]. has completely reacted was added the mixture stirred at 0° C. for 15 min The reaction was quenched with 5 ml water extracted with 5 ml ethyl acetate the aqueous phase extracted 2 times with 5 ml ethyl acetate The latter extracts were dried over MgSO4 concentrated was purified on silica with DCM/MeOH (5-20%)/NH4OH (1%)

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

Procedure: To a solution of chlorosulfonylacetyl chloride (419 μL, 3.955 mmol, 1 eq.) in Et2O (4 mL), at 0° C. was added MeOH (160 μL, 3.955 mmol, 1 eq.). The reaction mixture is strirred at 0° C. for 3 h, then concentrated in vacuo to give chlorosulfonyl-acetic acid methyl ester. concentrated in vacuo