1: 84 percent / 1,5-diazabicyclo<5.4.0>undecene-5 / tetrahydrofuran / Ambient temperature 2: 84 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / acetonitrile View Scheme

1,8-diazabicyclo[5.4.0]undec-7-ene in tetrahydrofuran Ambient temperature;

in dichloromethane T=0°C; Irradiation;

selenium(IV) oxide 1.) CH2Cl2, 0 degC, irradiation; 2.) ethyl acetate, reflux, 3 h.; Yield given. Multistep reaction;