Triphosgene → 1-Bromo-4-(1-isocyanatoethyl)benzene

HRID 333887Notes

Reaction equation

HRID 333887 reaction equation
[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C@@H:8]([NH2:10])[CH3:9])=[CH:4][CH:3]=1.[C:11]([O-])(O)=[O:12].[Na+].ClC(Cl)(OC(=O)OC(Cl)(Cl)Cl)Cl>C(Cl)Cl>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8]([N:10]=[C:11]=[O:12])[CH3:9])=[CH:4][CH:3]=1

Participants

5

Reactant 3

HCID 94429TriphosgeneHCID 516892Sodium BicarbonateHCID 852999(alphaS)-4-Bromo-alpha-methylbenzenemethanamine

Product 1

HCID 6109831-Bromo-4-(1-isocyanatoethyl)benzeneYield 63%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of (S)-1-(4-bromophenyl)ethanamine (240 g, 1.2 mol) in methylene chloride (3 L) and satd aq NaHCO3 (3 L) solution was added triphosgene (118 g, 0.396 mol) at 0° C. The mixture was stirred for 15 min. The organic phase was separated, dried over Na2SO4 and concentrated to give 1-bromo-4-(1-isocyanato-ethyl)-benzene (170 g, 63%).

Workup

  1. customThe organic phase was separated
  2. dry with materialdried over Na2SO4
  3. concentrationconcentrated

Sources & evidence

ORD record
ord-223f5924e1ac421bb514266a03526f86
Source dataset
uspto-grants-2014_11
Patent number
US08883778B2

Reaction notes

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