1,8-diazabicyclo[5.4.0]undec-7-ene in benzene T=23°C; 0.833333 h;

N,N,N',N',N'',N''-hexamethylphosphoric triamide; di-n-butylboryl trifluoromethanesulfonate; diisobutylaluminium hydride 1.) THF, hexane, 0 deg C, 30 min 2.) 0 deg C, 30 min, 25 deg C, 4 h 3.) dichloromethane, -78 deg C, 4 h, -15 deg C, 4 h; Yield given. Multistep reaction;