Hydrochloric Acid → HCID 14002850, compound

HRID 421738Notes

Reaction equation

HRID 421738 reaction equation
Cl[S:2]([CH2:5][C:6]([O:8][CH3:9])=[O:7])(=[O:4])=[O:3].[CH3:10][NH:11][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.Cl>C(Cl)Cl>[CH3:10][N:11]([C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1)[S:2]([CH2:5][C:6]([O:8][CH3:9])=[O:7])(=[O:4])=[O:3]

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 7515N-MethylanilineHCID 11435213Methyl (chlorosulfonyl)acetate

Product 1

HCID 14002850HCID 14002850, compound

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

Chlorine gas was passed through a suspension of 230 g of ice, CH2Cl2 (457 ml) and methyl thioglycolate (86 ml, 942 mmol), cooling with an ice/water bath to maintain an internal temperature below 30° C. After approximately six hours, the yellow/green color of the dissolved chlorine persisted for 30 minutes after gas flow was stopped and passing additional chlorine gas was no longer exothermic. The cooling bath was then removed and the biphasic mixture was allowed to stir at ambient temperature for 1 h before being sparged with nitrogen for 20 minutes. The layers were then separated and the organic phase was dried over Na2SO4, filtered and concentrated under reduced pressure to provide the intermediate methyl (chlorosulfonyl)acetate (160 g, 927 mmol) as a yellow oil. A portion of the intermediate methyl (chlorosulfonyl)acetate (100 g, 579 mmol) was added dropwise as a solution in CH2Cl2 (290 ml) to a stirring −15° C. solution of N-methylaniline (124 g, 1159 mmol) dissolved in CH2Cl2 (290 ml). The rate of addition was adjusted to maintain the internal temperature below 5° C. After the addition was complete, the reaction mixture was allowed to warm to room temperature over the course of 2 h and 1 M HCl (1000 mL) was added and the aqueous phase was extracted with dichloromethane (2×500 mL). The combined organics were dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure. The resulting oil was seed crystallized to afford a brown solid. Recrystallization from hot ethanol (320 mL) provided the title compound as an off-white solid. 1H NMR (600 MHz, DMSO-D6) δ 7.40 (m, 4H); 7.31 (m, 1H); 4.30 (s, 2H); 3.65 (s, 3H); 3.26 (s, 3H). LRMS (APCI) calculated for C25H21N4O3S [M+H]+, 244.1; found 244.0.

Workup

  1. additionThe rate of addition
  2. temperatureto maintain the internal temperature below 5° C
  3. additionAfter the addition
  4. additionwas added
  5. extractionthe aqueous phase was extracted with dichloromethane (2×500 mL)
  6. dry with materialThe combined organics were dried over anhydrous Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated under reduced pressure
  9. customcrystallized
  10. customto afford a brown solid
  11. customRecrystallization from hot ethanol (320 mL)

Sources & evidence

ORD record
ord-8cc2a88553634cc7a967a4fa02ac57e8
Source dataset
uspto-grants-2012_01
Patent number
US08101603B2

Reaction notes

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