Water → tert-butyl 8-carbamoyl-6-chloro-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate

HRID 1630009Notes

Reaction equation

HRID 1630009 reaction equation
[C:1]([C:4]1[CH:5]=[CH:6][N:7]2[CH2:12][CH2:11][N:10]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:9][C:8]=12)(=[O:3])[NH2:2].[Cl:20]N1C(=O)CCC1=O.O>ClCCl>[C:1]([C:4]1[CH:5]=[C:6]([Cl:20])[N:7]2[CH2:12][CH2:11][N:10]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:9][C:8]=12)(=[O:3])[NH2:2]

Participants

5

Reactant 3

HCID 962WaterHCID 31398ChlorosuccinimideHCID 66585088tert-butyl 8-carbamoyl-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate

Product 1

HCID 66585106tert-butyl 8-carbamoyl-6-chloro-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylateYield 73.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To a solution under nitrogen of 21.1 g (79.6 mmol) of tert-butyl 8-carbamoyl-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate in 600 ml of dichloromethane, cooled to −40° C., is added dropwise a solution of 10.6 g (79.6 mmol) of N-chlorosuccinimide in 200 ml of dichloromethane over about 40 minutes. Stirring is continued for 6 hours at a temperature of −40° C., 150 ml of water are then added and the reaction medium is allowed to warm to room temperature. The product is isolated by filtration and is washed with water to give 17.5 g of tert-butyl 8-carbamoyl-6-chloro-3,4-dihydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate in the form of a whitish solid after drying under reduced pressure at 40° C. in the presence of phosphorus pentoxide.

Workup

  1. additionare then added
  2. customThe product is isolated by filtration
  3. washis washed with water

Sources & evidence

ORD record
ord-fd4dc86fc87a42f5af3adb5e733fc05c
Source dataset
uspto-grants-2014_07
Patent number
US08791119B2

Reaction notes

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