1: 1.) NaH / 1.) DMF, 2.) 75 deg C, 2 h 2: 0.05 g / methanol / 1.5 h / Ambient temperature 3: 23 percent / H2S gas, NaOCH3 / methanol / 1.) RT, 2.3 h, 2.) 5 deg C, 18 h 4: 48 percent / mercuric(II) chloride, Et3N / dimethylformamide / 3 h / Ambient temperature View Scheme

1: 1.) NaH / 1.) DMF, 2.) 75 deg C, 2 h 2: 0.05 g / methanol / 1.5 h / Ambient temperature View Scheme

1: 1.) NaH / 1.) DMF, 2.) 75 deg C, 2 h 2: 0.05 g / methanol / 1.5 h / Ambient temperature 3: 23 percent / H2S gas, NaOCH3 / methanol / 1.) RT, 2.3 h, 2.) 5 deg C, 18 h View Scheme