Cesium carbonate → Tert-butyl 3-((5-chloro-2-methoxypyridin-3-yl)amino)azetidine-1-carboxylate

HRID 2283466Notes

Reaction equation

HRID 2283466 reaction equation
Br[C:2]1[C:3]([O:9][CH3:10])=[N:4][CH:5]=[C:6]([Cl:8])[CH:7]=1.[NH2:11][CH:12]1[CH2:15][N:14]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:13]1.C([O-])([O-])=O.[Cs+].[Cs+]>C1(C)C=CC=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd].CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2>[Cl:8][C:6]1[CH:7]=[C:2]([NH:11][CH:12]2[CH2:13][N:14]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:15]2)[C:3]([O:9][CH3:10])=[N:4][CH:5]=1

Participants

7

Reactant 3

HCID 10796Cesium carbonateHCID 1516507Tert-butyl 3-aminoazetidine-1-carboxylateHCID 135677513-Bromo-5-chloro-2-methoxypyridine

Product 1

HCID 118251077Tert-butyl 3-((5-chloro-2-methoxypyridin-3-yl)amino)azetidine-1-carboxylateYield 96.5%

Reagents, catalysts & solvents 3

HCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)CatalystHCID 9811564Bis(dibenzylideneacetone)palladiumCatalystHCID 1140TolueneSolvent

Conditions

Temperature
60 °C

Procedure

To a solution of 3-bromo-5-chloro-2-methoxypyridine (5.00 g, 33.7 mmol) in toluene (100 mL) was added tert-butyl 3-aminoazetidine-1-carboxylate (5.8 g, 18.5 mmol), Xantphos (650 mg, 1.12 mmol), Cs2CO3 (14.6 g, 44.9 mmol) and Pd2(dba)3 (514 mg, 0.562 mmol). The reaction mixture was stirred at 60° C. under nitrogen for 4 days. After cooling to RT, the reaction mixture was filtered, washed with ethyl acetate (100 mL), the organic layer washed with water (60 mL), brine (60 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by flash chromatography (ethyl acetate/hexane) to obtain 5.6 g of tert-butyl 3-((5-chloro-2-methoxypyridin-3-yl)amino)azetidine-1-carboxylate as a white-yellow oil (80%): 1H NMR (400 MHz, CDCl3) δ 7.39 (d, J=2.2 Hz, 1H), 6.36 (d, J=2.2 Hz, 1H), 4.52 (d, J=6.5 Hz, 1H), 4.24 (dd, J=8.9, 7.1 Hz, 2H), 4.05 (m, 1H), 3.89 (s, 3H), 3.70 (dd, J=9.1, 4.8 Hz, 2H), 1.37 (s, 9H); MS (ES) m/z 314 (M+H).

Workup

  1. temperatureAfter cooling to RT
  2. filtrationthe reaction mixture was filtered
  3. washwashed with ethyl acetate (100 mL)
  4. washthe organic layer washed with water (60 mL), brine (60 mL)
  5. dry with materialdried over Na2SO4
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customThe residue was purified by flash chromatography (ethyl acetate/hexane)

Sources & evidence

ORD record
ord-53590a55c9824de7a7753930b4f8f3a3
Source dataset
uspto-grants-2015_09
Patent number
US09145393B2

Reaction notes

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