1,8-diazabicyclo[5.4.0]undec-7-ene in tetrahydrofuran T=0 - 20°C; Alkylation;

1: orthoformic acid triethyl ester; hydrazinecarboxaldehyde in methanol Heating; 2: N-butylamine in methanol Heating; Further stages.;

lithium hydroxide; tetrabutylammomium bromide 24 h; Ambient temperaturealso benzotriazole; other alkyl halides; var. base as reagents; also reactions in the absence of base; var. temperatures and reaction time; also with conventional heating or microwave heating instead of phase transfer catalysis; Product distribution;