Trifluoroacetic acid → 3-[2-[3-Amino-6-[4-(4-piperidylsulfonyl)phenyl]pyrazin-2-yl]ethynyl]phenol

HRID 869041Notes

Reaction equation

HRID 869041 reaction equation
[NH2:1][C:2]1[N:3]=[CH:4][C:5]([C:17]2[CH:22]=[CH:21][C:20]([S:23]([CH:26]3[CH2:31][CH2:30][N:29](C(OC(C)(C)C)=O)[CH2:28][CH2:27]3)(=[O:25])=[O:24])=[CH:19][CH:18]=2)=[N:6][C:7]=1[C:8]#[C:9][C:10]1[CH:15]=[CH:14][CH:13]=[C:12]([OH:16])[CH:11]=1.C(O)(C(F)(F)F)=O>C(Cl)Cl>[NH2:1][C:2]1[C:7]([C:8]#[C:9][C:10]2[CH:11]=[C:12]([OH:16])[CH:13]=[CH:14][CH:15]=2)=[N:6][C:5]([C:17]2[CH:22]=[CH:21][C:20]([S:23]([CH:26]3[CH2:31][CH2:30][NH:29][CH2:28][CH2:27]3)(=[O:24])=[O:25])=[CH:19][CH:18]=2)=[CH:4][N:3]=1

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 67478804Tert-butyl 4-[4-[5-amino-6-[2-(3-hydroxyphenyl)ethynyl]pyrazin-2-yl]phenyl]sulfonylpiperidine-1-carboxylate

Product 1

HCID 546708463-[2-[3-Amino-6-[4-(4-piperidylsulfonyl)phenyl]pyrazin-2-yl]ethynyl]phenolYield 6.9%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Crude tert-butyl 4-[4-[5-amino-6-[2-(3-hydroxyphenyl)ethynyl]pyrazin-2-yl]phenyl]sulfonylpiperidine-1-carboxylate (184.3 mg, 0.3447 mmol—assumed quantitative yield from Step 3) was dissolved in DCM (5 mL) and TFA (1 mL, 12.98 mmol) was added. The reaction mixture was stirred at ambient temperature for 4 hours. The solvent was removed in vacuo and the residue azeotroped with DCM (×2) and ether (×2). The material was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH3CN) over 16 minutes at 25 mL/min]. The fractions were collected and freeze-dried to give the mono-TFA salt of the title compound as a yellow solid (10.3 mg, 5% Yield). 1H NMR (400.0 MHz, DMSO) δ 1.65-1.74 (m, 2H), 2.06 (d, 2H), 2.85-2.90 (m, 2H), 3.36 (d, 2H), 3.59-3.65 (m, 1H), 6.89 (dd, 1H), 7.14-7.21 (m, 2H), 7.27 (t, 1H), 7.90 (d, 2H), 8.23 (br s, 1H), 8.28 (d, 2H), 8.54 (br s, 1H), 8.77 (s, 1H) and 9.78 (s, 1H) ppm; MS (ES+) 435.1.

Workup

  1. customThe solvent was removed in vacuo
  2. customthe residue azeotroped with DCM (×2) and ether (×2)
  3. customThe material was purified by reverse phase preparative HPLC [Waters Sunfire C18, 10 μM, 100 Å column, gradient 10%-95% B (solvent A: 0.05% TFA in water; solvent B: CH3CN) over 16 minutes at 25 mL/min]
  4. customThe fractions were collected
  5. customfreeze-dried

Sources & evidence

ORD record
ord-8a0f00a8838e414bb954db562d5be8f1
Source dataset
uspto-grants-2015_03
Patent number
US08969356B2

Reaction notes

Loading…