1: 4.7 g / methanol / 20 h / Heating 2: 0.16 g / HOAc / 4 h / Heating View Scheme

1: 1) Na / 2) MeOH, 35 h, reflux 2: Li, n-BuBr 3: 1) potassium t-butoxide / 1) ether, t-butylalcohol, 30 min, 0deg C, 2) THF, 6h, reflux 4: 78 percent / 3 percent hydrochloric acid / 5 h / heating on water-bath 5: 43 percent / orthophosphoric acid, phosphorous pentoxide / 36 h / Ambient temperature; 1) heating on water-bath, 2 h View Scheme