1: 1) 1,8-diazabicyclo<5.4.0>undec-7-ene (DBU), 2) 1,3-dichloro-5,5-dimethylhydantoin (DCDMH) / 1) ethyl acetate, room temp., 30 min, 2) 20 - 25 deg C (ice-water bath), 90 min View Scheme

Yield given. Multistep reaction;