Pyridine → 1-(3-((2,2-difluoroethyl)amino)-2-(4-(2,4-difluorophenoxy)piperidin-1-yl)-7,8-dihydropyrido[3,4-b]pyrazin-6(5H)-yl)ethan-1-one

HRID 713307Notes

Reaction equation

HRID 713307 reaction equation
[OH:1][C:2]([C:4](F)(F)F)=O.[F:8][CH:9]([F:37])[CH2:10][NH:11][C:12]1[N:17]=[C:16]2[CH2:18][NH:19][CH2:20][CH2:21][C:15]2=[N:14][C:13]=1[N:22]1[CH2:27][CH2:26][CH:25]([O:28][C:29]2[CH:34]=[CH:33][C:32]([F:35])=[CH:31][C:30]=2[F:36])[CH2:24][CH2:23]1.N1C=CC=CC=1.C(OC(=O)C)(=O)C>C(Cl)Cl>[F:37][CH:9]([F:8])[CH2:10][NH:11][C:12]1[N:17]=[C:16]2[CH2:18][N:19]([C:2](=[O:1])[CH3:4])[CH2:20][CH2:21][C:15]2=[N:14][C:13]=1[N:22]1[CH2:23][CH2:24][CH:25]([O:28][C:29]2[CH:34]=[CH:33][C:32]([F:35])=[CH:31][C:30]=2[F:36])[CH2:26][CH2:27]1

Participants

5

Reactant 3

HCID 1049PyridineHCID 7918Acetic AnhydrideHCID 131734033N-(2,2-difluoroethyl)-2-(4-(2,4-difluorophenoxy)piperidin-1-yl)-5,6,7,8-tetrahydropyrido[3,4-b]pyrazin-3-amine TFA salt

Product 1

HCID 1181592891-(3-((2,2-difluoroethyl)amino)-2-(4-(2,4-difluorophenoxy)piperidin-1-yl)-7,8-dihydropyrido[3,4-b]pyrazin-6(5H)-yl)ethan-1-one

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
0 °C

Procedure

A solution of N-(2,2-difluoroethyl)-2-(4-(2,4-difluorophenoxyl)piperidin-1-yl)-5,6,7,8-tetrahydropyrido[3,4-b]pyrazin-3-amine TFA salt (114 mg, 0.211 mmol) in DCM (2.11 mL) at 0° C. was treated with pyridine (0.051 mL, 0.63 mmol) and acetic anhydride (0.040 mL, 0.42 mmol). The reaction mixture was stirred for 30 min at 0° C. The reaction mixture was concentrated under reduced pressure. The residue was taken up in MeOH, filtered, and purified by HPLC Method B, using a 40% to 70% ACN gradient to give the title compound, as a TFA salt, as a yellow solid (39.7 mg, 32.3%). 1H NMR (500 MHz, methanol-d4, mixture of rotamers) δ ppm 1.96 (m, 2H), 2.12 (m, 2H), 2.18 (s, 1.3H), 2.20 (s, 1.7H), 2.73 (t, J=5.9 Hz, 0.8H), 2.83 (t, J=5.9 Hz, 1.2H), 3.01 (m, 2H), 3.39 (m, 2H), 3.80 (m, 4H), 4.45 (dt, J=7.0, 3.6 Hz, 1H), 4.57 (app d, 2H), 6.05 (m, 1H), 6.86 (m, 1H), 6.96 (ddd, J=11.2, 8.5, 3.2 Hz, 1H), 7.15 (td, J=9.2, 5.6 Hz, 1H); ESI-MS m/z [M+H]+ 468.4.

Workup

  1. concentrationThe reaction mixture was concentrated under reduced pressure
  2. filtrationfiltered
  3. custompurified by HPLC Method B

Sources & evidence

ORD record
ord-14a49d06f658478abc1547fac7a0e2d6
Source dataset
uspto-grants-2015_11
Patent number
US09181249B2

Reaction notes

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