Tributylphosphine → ethyl 3-(4-((1-(4-chlorophenyl)-3-(trifluoromethyl)-1H-pyrrol-2-yl)methoxy)-3,5-difluorophenyl)propanoate

HRID 1404162Notes

Reaction equation

HRID 1404162 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[CH:12]=[CH:11][C:10]([C:13]([F:16])([F:15])[F:14])=[C:9]2[CH2:17][OH:18])=[CH:4][CH:3]=1.[F:19][C:20]1[CH:21]=[C:22]([CH2:28][CH2:29][C:30]([O:32][CH2:33][CH3:34])=[O:31])[CH:23]=[C:24]([F:27])[C:25]=1O.N(C(N1CCCCC1)=O)=NC(N1CCCCC1)=O.C(P(CCCC)CCCC)CCC>C1(C)C=CC=CC=1.CCCCCCC>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([N:8]2[CH:12]=[CH:11][C:10]([C:13]([F:14])([F:15])[F:16])=[C:9]2[CH2:17][O:18][C:25]2[C:24]([F:27])=[CH:23][C:22]([CH2:28][CH2:29][C:30]([O:32][CH2:33][CH3:34])=[O:31])=[CH:21][C:20]=2[F:19])=[CH:6][CH:7]=1

Participants

7

Reactant 4

HCID 13831TributylphosphineHCID 730421,1'-(Azodicarbonyl)dipiperidineHCID 23136305Ethyl 3-(3,5-difluoro-4-hydroxyphenyl)propanoateHCID 90404801(1-(4-chlorophenyl)-3-(trifluoromethyl)-1H-pyrrol-2-yl)methanol

Product 1

HCID 90405892ethyl 3-(4-((1-(4-chlorophenyl)-3-(trifluoromethyl)-1H-pyrrol-2-yl)methoxy)-3,5-difluorophenyl)propanoate

Reagents, catalysts & solvents 2

HCID 1140TolueneSolventHCID 8900HeptaneSolvent

Procedure

A solution of the product prepared in Step D (1.33 g, 4.84 mmol, 1 eq), ethyl 3-(3,5-difluoro-4-hydroxyphenyl)propanoate (1.78 g, 7.74 mmol, 1.6 eq), 1,1′-(azodicarbonyl)dipiperidine (2.52 g, 9.68 mmol, 2 eq) and tri-n-butylphosphine (3.08 mL, 12.1 mmol, 2.5 eq) in toluene (85 mL) was heated to 60° C. under N2. After 3 hr, heptane (170 mL) was added and the resulting suspension allowed to cool to room temperature over 30 min. The resulting white solid byproduct was filtered, washed with heptane, and the filtrate concentrated. The resulting residue was purified by flash chromatography (120 g column) eluting with 2 to 12% EtOAc/heptane to yield ethyl 3-(4-((1-(4-chlorophenyl)-3-(trifluoromethyl)-1H-pyrrol-2-yl)methoxy)-3,5-difluorophenyl)propanoate.

Workup

  1. filtrationThe resulting white solid byproduct was filtered
  2. washwashed with heptane
  3. concentrationthe filtrate concentrated
  4. customThe resulting residue was purified by flash chromatography (120 g column)
  5. washeluting with 2 to 12% EtOAc/heptane

Sources & evidence

ORD record
ord-c372ff16ad644b92b54370c698d58208
Source dataset
uspto-grants-2014_12
Patent number
US08912227B1

Reaction notes

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