Potassium Phosphate, Tribasic → (R)-tert-butyl 3-(6-(5-(2,6-difluorophenyl)-1-tosyl-1H-indol-3-yl)pyrazin-2-yloxy)piperidine-1-carboxylate

HRID 1529300Notes

Reaction equation

HRID 1529300 reaction equation
[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([F:8])[C:3]=1[C:9]1[CH:10]=[C:11]2[C:15](=[CH:16][CH:17]=1)[N:14]([S:18]([C:21]1[CH:27]=[CH:26][C:24]([CH3:25])=[CH:23][CH:22]=1)(=[O:20])=[O:19])[CH:13]=[C:12]2B1OC(C)(C)C(C)(C)O1.Cl[C:38]1[N:43]=[C:42]([O:44][C@@H:45]2[CH2:50][CH2:49][CH2:48][N:47]([C:51]([O:53][C:54]([CH3:57])([CH3:56])[CH3:55])=[O:52])[CH2:46]2)[CH:41]=[N:40][CH:39]=1.P([O-])([O-])([O-])=O.[K+].[K+].[K+]>O1CCOCC1.O.O>[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([F:8])[C:3]=1[C:9]1[CH:10]=[C:11]2[C:15](=[CH:16][CH:17]=1)[N:14]([S:18]([C:21]1[CH:22]=[CH:23][C:24]([CH3:25])=[CH:26][CH:27]=1)(=[O:19])=[O:20])[CH:13]=[C:12]2[C:38]1[N:43]=[C:42]([O:44][C@@H:45]2[CH2:50][CH2:49][CH2:48][N:47]([C:51]([O:53][C:54]([CH3:57])([CH3:56])[CH3:55])=[O:52])[CH2:46]2)[CH:41]=[N:40][CH:39]=1

Participants

6

Reactant 3

HCID 62657Potassium Phosphate, TribasicHCID 57502428(R)-tert-butyl 3-(6-chloropyrazin-2-yloxy)piperidine-1-carboxylateHCID 679600185-(2,6-difluorophenyl)-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1-tosyl-1H-indole

Product 1

HCID 67958620(R)-tert-butyl 3-(6-(5-(2,6-difluorophenyl)-1-tosyl-1H-indol-3-yl)pyrazin-2-yloxy)piperidine-1-carboxylateYield 88.3%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 218864351,4-Dioxane--water (1/1)Solvent

Conditions

Temperature
110 °C

Procedure

A glass microwave reaction vessel was charged with 5-(2,6-difluorophenyl)-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1-tosyl-1H-indole (2.75 g, 5.40 mmol) and (R)-tert-butyl 3-(6-chloropyrazin-2-yloxy)piperidine-1-carboxylate (1.694 g, 5.40 mmol) in p-dioxane/H2O (4:1, 16 mL) followed by A-Phos (0.191 g, 0.270 mmol) and potassium phosphate (2.92 g, 10.80 mmol). The reaction mixture was stirred and heated in a Initiator microwave reactor (Personal Chemistry, Biotage AB, Inc., Uppsala, Sweden) at 110° C. for 80 min. The reaction mixture was diluted with water and extracted with DCM. The combined organic layers were dried, filtered and concentrated. The residue was purified with silica gel chromatography (eluting with 10-20% EtOAc in Hexanes) to give (R)-tert-butyl 3-(6-(5-(2,6-difluorophenyl)-1-tosyl-1H-indol-3-yl)pyrazin-2-yloxy)piperidine-1-carboxylate (3.15 g, 4.77 mmol, 88% yield) as a solid. MS (ESI, pos. ion) m/z: 661 (M+1).

Workup

  1. customA glass microwave reaction vessel
  2. extractionextracted with DCM
  3. customThe combined organic layers were dried
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe residue was purified with silica gel chromatography (eluting with 10-20% EtOAc in Hexanes)

Sources & evidence

ORD record
ord-526372e4c6f448fab9e722f69742623a
Source dataset
uspto-grants-2015_07
Patent number
US09090593B2

Reaction notes

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