Trifluoroacetic acid → rac-(3R,4S)-1-Benzyl-3-(4-fluoro-phenyl)-4-nitro-pyrrolidine

HRID 1365909Notes

Reaction equation

HRID 1365909 reaction equation
CO[CH2:3][N:4]([CH2:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)[CH2:5][Si](C)(C)C.[F:17][C:18]1[CH:23]=[CH:22][C:21](/[CH:24]=[CH:25]/[N+:26]([O-:28])=[O:27])=[CH:20][CH:19]=1.FC(F)(F)C(O)=O>C(Cl)Cl>[CH2:10]([N:4]1[CH2:5][CH:25]([N+:26]([O-:28])=[O:27])[CH:24]([C:21]2[CH:22]=[CH:23][C:18]([F:17])=[CH:19][CH:20]=2)[CH2:3]1)[C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1

Participants

5

Reactant 3

HCID 6422Trifluoroacetic acidHCID 353442Benzyl(methoxymethyl)((trimethylsilyl)methyl)amineHCID 53816801-Fluoro-4-((1E)-2-nitroethenyl)benzene

Product 1

HCID 66940721rac-(3R,4S)-1-Benzyl-3-(4-fluoro-phenyl)-4-nitro-pyrrolidineYield 72%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Conditions

Temperature
25 °C

Procedure

A solution of N-(methoxymethyl)-N-(phenylmethyl)-N-(trimethylsilyl)methylamine (8.00 g, 33.6 mmol) in CH2Cl2 (140 ml) was added drop wise, over a 30 minutes period, to a stirred solution of 1-fluoro-4-((E)-2-nitro-vinyl)-benzene (5.12 g, 30.6 mmol) and trifluoroacetic acid (0.23 ml, 3.1 mmol) in CH2Cl2 (200 ml) at 0° C. The ice bath was removed, and the solution was stirred at 25° C. for an additional 48 h. It was then concentrated and purification by flash chromatography (SiO2, EtOAc/H 1:4) afforded 6.60 g (72%) of the title compound as a light yellow oil.

Workup

  1. customat 0° C
  2. customThe ice bath was removed
  3. concentrationIt was then concentrated
  4. custompurification by flash chromatography (SiO2, EtOAc/H 1:4)

Sources & evidence

ORD record
ord-64254a202a3e40b3a0410dcc6dc1b35e
Source dataset
uspto-grants-2011_02
Patent number
US07893062B2

Reaction notes

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