反应详情

Crude 2-[2-(1-piperidyl)-2-phenyl-ethenyl]-1-pyrroline is produced by refluxing for 12 hours the solution of 9.1 g (0.03 mole) of 2-(2-ethoxy-2-phenyl-ethenyl)-1-pyrroline-tetrafluoroborate in 25 ml of piperidine, and processing the reaction mixture analogously to Example 1. By the addition of 2.8 g of methanesulphonic acid to the solution of the crude base in isopropanol, concentration of this solution in the rotary evaporator and recrystallisation of the residue from acetone/hexane, there is obtained 2-[2-(1-piperidyl-2-phenylethenyl]-1-pyrroline-(1:1)-methanesulphonate, m.p. 123°-124°.

1. customin the rotary evaporator and recrystallisation of the residue from acetone/hexane