1: 2.) conc. H2SO4, aq. AcOH / 1.) Et2O, 0 deg C to RT, 14 h, 2.) reflux, 7 h 2: 1.) Et2O*BF3, 2.) N,N-diisopropyl ethylamine / 1.) CH2Cl2, 0 deg C, 15 min, 2.) CH2Cl2, -20 deg C to -10 deg C, 2 h View Scheme

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boron trifluoride diethyl etherate; N-ethyl-N,N-diisopropylamine 1.) CH2Cl2, 0 deg C, 15 min, 2.) CH2Cl2, -20 deg C to -10 deg C, 2 h; Yield given. Multistep reaction;