ammonium hydroxide in tetrahydrofuran Yield given;

1: 1.) SO2Cl2, 2.) NaN3, NaI / 1.) CH2Cl2, reflux, 2.) CH3CN, reflux 2: LDA / tetrahydrofuran 3: aq. ammonium hydroxide / tetrahydrofuran View Scheme

1: LDA / tetrahydrofuran 2: aq. ammonium hydroxide / tetrahydrofuran View Scheme