Nitrogen → tert-Butyl 3-(3-methylpyridin-2-yl)benzoate

HRID 402554

Reaktionsgleichung

Br[C:2]1[C:7]([CH3:8])=[CH:6][CH:5]=[CH:4][N:3]=1.C([O-])([O-])=O.[K+].[K+].N#N.[C:17]([O:21][C:22]([C:24]1[CH:25]=[C:26](B(O)O)[CH:27]=[CH:28][CH:29]=1)=[O:23])([CH3:20])([CH3:19])[CH3:18].C(Cl)Cl.CS(O)(=O)=O.[OH-].[Na+]>C1(C)C=CC=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2].O>[C:17]([O:21][C:22](=[O:23])[C:24]1[CH:25]=[CH:26][CH:27]=[C:28]([C:2]2[C:7]([CH3:8])=[CH:6][CH:5]=[CH:4][N:3]=2)[CH:29]=1)([CH3:20])([CH3:18])[CH3:19]

Komponenten

Reaktionsbedingungen

Temperatur: 80 °C

Versuchsvorschrift

2-Bromo-3-methylpyridine (1.0 eq) was dissolved in toluene (12 vol). K2CO3 (4.8 eq) was added, followed by water (3.5 vol). The resulting mixture was heated to 65° C. under a stream of N2 for 1 hour. 3-(t-Butoxycarbonyl)phenylboronic acid (1.05 eq) and Pd(dppf)Cl2.CH2Cl2 (0.015 eq) were then added, and the mixture was heated to 80° C. After 2 hours, the heat was turned off, water was added (3.5 vol), and the layers were allowed to separate. The organic phase was then washed with water (3.5 vol) and extracted with 10% aqueous methanesulfonic acid (2 eq MsOH, 7.7 vol). The aqueous phase was made basic with 50% aqueous NaOH (2 eq) and extracted with EtOAc (8 vol). The organic layer was concentrated to afford crude tert-butyl-3-(3-methylpyridin-2-yl)benzoate (82%) that was used directly in the next step.

Aufarbeitung

customto separate
washThe organic phase was then washed with water (3.5 vol)
extractionextracted with EtOAc (8 vol)
concentrationThe organic layer was concentrated

Quellen und Nachweise

ORD-Eintrag: ord-3c7c2f5ff82146528e888c36b85ef494
Quelldatensatz: uspto-grants-2014_06
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US08742122B2

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