1: 1.) NaH / 1.) DMF, 60 deg C, 1 h, 2.) DMF, 60 deg C, 5 h 2: 1.) N-methylmorpholine, 2.) BF3*OEt2 / 1.) 1,2-dichloroethane, RT, 2 h, 2.) 1,2-dichloroethane, RT, overnight View Scheme

4-methyl-morpholine; boron trifluoride diethyl etherate 1.) 1,2-dichloroethane, RT, 2 h, 2.) 1,2-dichloroethane, RT, overnight; Yield given. Multistep reaction;