Dichloromethane → (NE,R)-2-methyl-N-[[4-[4-(trifluoromethyl)phenyl]phenyl]methylidene]propane-2-sulfinamide

HRID 1427421Notes

Reaction equation

HRID 1427421 reaction equation
[F:1][C:2]([F:18])([F:17])[C:3]1[CH:8]=[CH:7][C:6]([C:9]2[CH:14]=[CH:13][C:12]([CH:15]=O)=[CH:11][CH:10]=2)=[CH:5][CH:4]=1.[CH3:19][C:20]([S@:23]([NH2:25])=[O:24])([CH3:22])[CH3:21].ClCCl.C(=O)(O)[O-].[Na+]>[O-]CC.[Ti+4].[O-]CC.[O-]CC.[O-]CC.[Ti].CO>[CH3:19][C:20]([S@:23](/[N:25]=[CH:15]/[C:12]1[CH:13]=[CH:14][C:9]([C:6]2[CH:7]=[CH:8][C:3]([C:2]([F:18])([F:17])[F:1])=[CH:4][CH:5]=2)=[CH:10][CH:11]=1)=[O:24])([CH3:22])[CH3:21]

Participants

8

Reactant 4

HCID 6344DichloromethaneHCID 516892Sodium BicarbonateHCID 27827124'-(Trifluoromethyl)-4-biphenylcarbaldehydeHCID 10964479tert-Butylsulfinamide, (R)-(+)-

Product 1

HCID 88540239(NE,R)-2-methyl-N-[[4-[4-(trifluoromethyl)phenyl]phenyl]methylidene]propane-2-sulfinamideYield 84%

Reagents, catalysts & solvents 3

HCID 23963TitaniumCatalystHCID 76524Titanium tetraethoxideCatalystHCID 887MethanolSolvent

Procedure

A round bottom flask equipped with a condenser was charged with 4′-(trifluoromethyl)biphenyl-4-carbaldehyde (20.0 g, 79.9 mmol), (R)-(+)-2-methylpropane-2-sulfinamide (9.69 g, 79.9 mmol) and dichloromethane (400 mL). Titanium(IV) ethoxide (33.2 mL, 160 mmol) was then added, and the mixture was heated to reflux for 3 hours. Methanol (50 mL) and saturated sodium bicarbonate (10 mL) were then added to the reaction, causing the titanium salts to precipitate. This mixture was stirred for 30 minutes and then filtered, rinsing with ethyl acetate. Sodium sulfate was added to the filtrate to remove the water and then filtered a second time. The solvent was removed under reduced pressure to afford (R,E)-2-methyl-N-((4′-(trifluoromethyl)biphenyl-4-yl)methylene)propane-2-sulfinamide (23.7 g, 84%) as a white solid. 1H NMR (400 MHz, CDCl3, δ): 1.30 (s, 9H) 7.70-7.74 (m, 2H) 7.74 (s, 4H) 7.95-7.99 (m, 2H) 8.66 (s, 1H). MS (M+1): 354.1.

Workup

  1. customA round bottom flask equipped with a condenser
  2. temperaturethe mixture was heated
  3. temperatureto reflux for 3 hours
  4. customto precipitate
  5. filtrationfiltered
  6. washrinsing with ethyl acetate
  7. additionSodium sulfate was added to the filtrate
  8. customto remove the water
  9. filtrationfiltered a second time
  10. customThe solvent was removed under reduced pressure

Sources & evidence

ORD record
ord-0438b0b353d0448899bb97b32c32d5c2
Source dataset
uspto-grants-2015_01
Patent number
US08933104B2

Reaction notes

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