Reaktion #537051

Reaktionsgleichung

4-(tert-butoxycarbonylamino)-2,6-dichlorophenyl trifluoromethanesulfonate

dppp

Et3N

→

methyl 4-(tert-butoxy carbonylamino)-2,6-dichlorobenzoate

Ausbeute 119.4%

Lösungsmittel

MeOH

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwas refluxed under an atmosphere of carbon monoxide (10 atm) overnight
2. 2
   EinengenThe reaction was concentrated under reduced pressure
3. 3
   Sonstigethe residue was purified by column chromatography on silica gel (petroleum ether/EtOAc 80:1)

Vorschrift

A mixture of 4-(tert-butoxycarbonylamino)-2,6-dichlorophenyl trifluoromethanesulfonate (14 g, 34 mmol), dppp (1.4 g, 3.4 mmol), Pd(OAc)2 (0.84 g, 3.4 mol) and Et3N (19.6 mL) in MeOH (112 mL) and DMF (224 mL) was refluxed under an atmosphere of carbon monoxide (10 atm) overnight. The reaction was concentrated under reduced pressure and the residue was purified by column chromatography on silica gel (petroleum ether/EtOAc 80:1) to give methyl 4-(tert-butoxy carbonylamino)-2,6-dichlorobenzoate (6.5 g, yield: 60%). 1H NMR (CDCl3, 400 MHz) δ 7.40 (s, 2H), 6.56 (brs, 1H), 3.94 (s, 3H), 1.51 (s, 9H).

Quelle