3-Chloropropionyl chloride → N-[(R)-1-(5-bromo-2-fluoro-phenyl)-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-3-chloro-N-(4-methoxy-benzyl)-propionamide

HRID 1186182Notes

Reaction equation

HRID 1186182 reaction equation
[Br:1][C:2]1[CH:3]=[CH:4][C:5]([F:29])=[C:6]([C@:8]([NH:19][CH2:20][C:21]2[CH:26]=[CH:25][C:24]([O:27][CH3:28])=[CH:23][CH:22]=2)([CH3:18])[CH2:9][O:10][Si:11]([C:14]([CH3:17])([CH3:16])[CH3:15])([CH3:13])[CH3:12])[CH:7]=1.C(=O)([O-])O.[Na+].[Cl:35][CH2:36][CH2:37][C:38](Cl)=[O:39]>C(Cl)(Cl)Cl>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([F:29])=[C:6]([C@:8]([N:19]([CH2:20][C:21]2[CH:22]=[CH:23][C:24]([O:27][CH3:28])=[CH:25][CH:26]=2)[C:38](=[O:39])[CH2:37][CH2:36][Cl:35])([CH3:18])[CH2:9][O:10][Si:11]([C:14]([CH3:17])([CH3:16])[CH3:15])([CH3:12])[CH3:13])[CH:7]=1

Participants

5

Reactant 3

HCID 693643-Chloropropionyl chlorideHCID 516892Sodium BicarbonateHCID 66931457[(R)-1-(5-bromo-2-fluoro-phenyl)-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-(4-methoxy-benzyl)-amine

Product 1

HCID 58562947N-[(R)-1-(5-bromo-2-fluoro-phenyl)-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-3-chloro-N-(4-methoxy-benzyl)-propionamide

Reagents, catalysts & solvents 1

HCID 6212ChloroformSolvent

Procedure

A suspension of [(R)-1-(5-bromo-2-fluoro-phenyl)-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-(4-methoxy-benzyl)-amine (7.98 g, 16.5 mmol) in a mixture of chloroform (52 ml) and saturated sodium hydrogen carbonate solution (78 ml) was treated dropwise at 0° C. with 3-chloropropanoyl chloride (2.57 g, 19.8 mmol). The reaction mixture was left to warm to room temperature and vigorous stirring continued for 16 hours. For the workup, the layers were separated, the aqueous layer extracted with chloroform (100 ml), thereupon, the combined organic layers dried over sodium sulfate and evaporated at reduced pressure. After chromatography on Silicycle-Si-amine column using a gradient of heptane and ethyl acetate=100/0 to 60/10 as the eluent, besides recovery of 57% of the starting material, N-[(R)-1-(5-bromo-2-fluoro-phenyl)-2-(tert-butyl-dimethyl-silanyloxy)-1-methyl-ethyl]-3-chloro-N-(4-methoxy-benzyl)-propionamide (intermediate C9A) was obtained as a colourless viscous oil (2.08 g, 22% of theory). MS (ISP): m/z=536.2, 538.3 [M−Cl+H]+.

Workup

  1. waitThe reaction mixture was left
  2. customFor the workup, the layers were separated
  3. extractionthe aqueous layer extracted with chloroform (100 ml)
  4. dry with materialthe combined organic layers dried over sodium sulfate
  5. customevaporated at reduced pressure

Sources & evidence

ORD record
ord-7597e71c73ae42ffa0cabe5fe7f26d5d
Source dataset
uspto-grants-2014_03
Patent number
US08673894B2

Reaction notes

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