Chloroform → 3-Ethyl-3,5,5-trimethyl-1-(propan-2-yl)piperazin-2-one

참여 물질

반응 단계

40 g (1 mol) of finely ground NaOH are added, with stirring, to a solution of 24.6 g (0.189 mol) of N-1-isopropyl-2-methylpropane-1,2-diamine (prepared in accordance with M. Senkus.: J. Am. Chem. Soc. 68, 10 (1946)) and 25 ml (0.3 mol) of chloroform in 250 ml (2.77 mol) of methyl ethyl ketone at 10° C. The reaction mixture is stirred for 16 hours at room temperature and is then filtered. The filtrate, concentrated by evaporation in a rotary evaporator, is chromatographed over silica gel with hexane/ethyl acetate (3:2). The pure fractions are concentrated by evaporation, giving 13.7 g (33%) of compound (229) in the form of a colourless oil.

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