1: 86 percent / K2CO3 / ethanol / 15 h / Heating 2: 1.) potassium tert-butoxide 2.) 4N hydrochloric acid / 1.) Et2O, 0 deg C, 30 min 2.) methanol, 3 h reflux View Scheme

1: 86 percent / K2CO3 / ethanol / 15 h / Heating 2: 1.) potassium tert-butoxide 2.) 4N hydrochloric acid / 1.) Et2O, 0 deg C, 30 min 2.) methanol, 3 h reflux View Scheme