ammonium hydroxide; 1,8-diazabicyclo[5.4.0]undec-7-ene; H2O; trimethylamine multistep reaction; 1.) THF, 0 deg C, 10 min (sealed vessel), 2.) THF, RT, 1 h, 3.) 55 deg C, 20 h (sealed vessel); FAB+-MS spectra; Product distribution;