tert-Butyl acrylate → tert-butyl (E)-3-(7-oxo-5,6,7,8-tetrahydro-1,8-naphthyridin-3-yl)acrylate

HRID 1361976

Reaction equation

HRID 1361976 reaction equation
Br[C:2]1[CH:3]=[C:4]2[C:9](=[N:10][CH:11]=1)[NH:8][C:7](=[O:12])[CH2:6][CH2:5]2.[C:13]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])(=[O:16])[CH:14]=[CH2:15].CCN(C(C)C)C(C)C.CC1C=CC=CC=1P(C1C=CC=CC=1C)C1C=CC=CC=1C>C(#N)CC.CN(C=O)C.CC([O-])=O.CC([O-])=O.[Pd+2]>[O:12]=[C:7]1[NH:8][C:9]2[N:10]=[CH:11][C:2](/[CH:15]=[CH:14]/[C:13]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])=[CH:3][C:4]=2[CH2:5][CH2:6]1

Participants

8

Reactant 4

HCID 15458tert-Butyl acrylateHCID 80271Tri-o-tolylphosphineHCID 81531DiisopropylethylamineHCID 110963256-Bromo-3,4-dihydro-1,8-naphthyridin-2(1H)-one

Product 1

HCID 10869488tert-butyl (E)-3-(7-oxo-5,6,7,8-tetrahydro-1,8-naphthyridin-3-yl)acrylateYield 45.3%

Reagents, catalysts & solvents 3

HCID 167845palladium(II) acetateCatalystHCID 6228DimethylformamideSolventHCID 7854PropionitrileSolvent

Procedure

A solution of 6-bromo-3,4-dihydro-1H-1,8-naphthyridin-2-one (12.99 g, 57 mmole), tert-butyl acrylate (34 mL, 232 mmole), DIEA (21.2 mL, 122 mmole), Pd(OAc)2 (1.3 g, 5.8 mmole) and P(o-tol)3 (3.5 g, 11.5 mmole) in propionitrile (200 mL) and DMF (50 mL) was purged with Ar, then was heated at reflux. After 18 h the reaction was allowed to cool to room temperature and was concentrated to dryness. The residue was purified by flash chromatography on silica gel (2-4% MeOH/CHCl3). The resulting residue was triturated with 1:1 Et2O/petroleum ether, collected, and dried, and the resulting material was triturated with 1:1 MeOH/H2O, collected, and dried, to give the title compound (7.09 g, 45%) as an off-white solid: 1H NMR (400 MHz, d6-DMSO) δ 10.70 (s, 1H), 8.35 (d, J=2.0 Hz, 1H), 8.04 (s, 1H), 7.50 (d, J=16.0 Hz, 1H), 6.51 (d, J=16.0 Hz, 1H), 2.89 (t, 2H), 2.53 (t, 2H), 1.48 (s, 9H); MS (ES) m/e 275.2 (M+H)+.

Workup

  1. temperaturewas heated
  2. temperatureat reflux
  3. concentrationwas concentrated to dryness
  4. customThe residue was purified by flash chromatography on silica gel (2-4% MeOH/CHCl3)
  5. customThe resulting residue was triturated with 1:1 Et2O/petroleum ether
  6. customcollected
  7. customdried
  8. customthe resulting material was triturated with 1:1 MeOH/H2O
  9. customcollected
  10. customdried

Sources & evidence

ORD record
ord-c379dcb3262c4fefb093ab1deb575ec1
Source dataset
uspto-grants-2011_02
Patent number
US07879872B2

Linked notes

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