1: 57 percent / ethanol / 0.25 h / Heating 2: 84 percent / POCl3, N,N-diethylaniline / 2 h / Ambient temperature 3: 91 percent / Et3N, H2 / Pd-C / benzene 4: 72 percent / toluene / 4 h / Heating View Scheme

in methanol 3 h; Heating;

1: 71 percent / methanol / 3 h / Heating 2: 93 percent / P2S5 / dioxane / 2 h / Heating View Scheme