6-Chloronicotinic acid → (2S)-1-[(6-Chloro-3-pyridinyl)carbonyl]-2-methyl-4-{[4-(trifluoromethyl)phenyl]sulfonyl}piperazine

HRID 43412Notes

Reaction equation

HRID 43412 reaction equation
CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.[Cl:25][C:26]1[N:31]=[CH:30][C:29]([C:32]([OH:34])=O)=[CH:28][CH:27]=1.CCN(C(C)C)C(C)C.[CH3:44][C@@H:45]1[NH:50][CH2:49][CH2:48][N:47]([S:51]([C:54]2[CH:59]=[CH:58][C:57]([C:60]([F:63])([F:62])[F:61])=[CH:56][CH:55]=2)(=[O:53])=[O:52])[CH2:46]1>CN(C=O)C>[Cl:25][C:26]1[N:31]=[CH:30][C:29]([C:32]([N:50]2[CH2:49][CH2:48][N:47]([S:51]([C:54]3[CH:55]=[CH:56][C:57]([C:60]([F:63])([F:61])[F:62])=[CH:58][CH:59]=3)(=[O:52])=[O:53])[CH2:46][C@@H:45]2[CH3:44])=[O:34])=[CH:28][CH:27]=1

Participants

6

Reactant 4

HCID 792226-Chloronicotinic acidHCID 81531DiisopropylethylamineHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 59152086(S)-3-Methyl-1-((4-(trifluoromethyl)phenyl)sulfonyl)piperazine

Product 1

HCID 59161366(2S)-1-[(6-Chloro-3-pyridinyl)carbonyl]-2-methyl-4-{[4-(trifluoromethyl)phenyl]sulfonyl}piperazineYield 98%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

HATU (458 mg, 1.21 mmol) was added to a solution of 6-chloro-3-pyridinecarboxylic acid (supplied by Aldrich) (174 mg, 1.10 mmol) in DMF (4 ml) and the mixture was treated with DIPEA (0.437 ml, 2.50 mmol). This mixture was stirred for ca. 10 min at ambient temperature. (3S)-3-Methyl-1-{[4-(trifluoromethyl)phenyl]sulfonyl}piperazine (may be prepared as described in Description 2) (308 mg, 1.0 mmol) was added and stirring was continued for 1.25 h. The reaction mixture was partitioned between DCM and saturated aqueous NaHCO3 solution (20 ml each). The layers were separated and the aqueous layer was washed with further DCM (2×20 ml). The combined organic layers were concentrated to leave a dark brown gum. Purification by silica chromatography (Biotage SP4, 25S cartridge), eluting with 12-100% ethyl acetate in pentane, gave the title compound (439 mg) as a pale yellow gum.

Workup

  1. stirringstirring
  2. waitwas continued for 1.25 h
  3. customThe reaction mixture was partitioned between DCM and saturated aqueous NaHCO3 solution (20 ml each)
  4. customThe layers were separated
  5. washthe aqueous layer was washed with further DCM (2×20 ml)
  6. concentrationThe combined organic layers were concentrated
  7. customto leave a dark brown gum
  8. customPurification by silica chromatography (Biotage SP4, 25S cartridge)
  9. washeluting with 12-100% ethyl acetate in pentane

Sources & evidence

ORD record
ord-19f26389ec8241b5b8611c084453cac5
Source dataset
uspto-grants-2013_09
Patent number
US08536183B2

Reaction notes

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