3,4-dihydro-2H-pyran → N-ethyl-N-[2-(tetrahydropyran-2-yl)oxyethyl]-4-bromoaniline

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

14.7 g (60.3 mmols) of N-ethyl-N-(2-hydroxyethyl)-4-bromoaniline, 90 ml of chloroform, 10.68 ml (2.0-fold equivalent weight) of 3,4-dihydro-2H-pyran and 0.76 g (0.05-fold equivalent weight) of pyridine p-toluenesulfonate were mixed, and the mixture obtained was heated at 70° C. for 1.5 hours in an atmosphere of argon. Thereafter, a saturated aqueous sodium hydrogencarbonate solution was added to the reaction solution obtained, which was then extracted with chloroform (200 ml×2). The organic layer thus formed was washed with a saturated aqueous sodium hydrogencarbonate solution, which was then dried with anhydrous magnesium sulfate and thereafter concentrated. The residue thus obtained was purified by silica gel column chromatography (developing system: chloroform) to obtain 18.90 g of N-ethyl-N-[2-(tetrahydropyran-2-yl)oxyethyl]-4-bromoaniline (yield: quantitative; a colorless oily liquid).

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