1: 72 percent / Raney-Ni / dioxane; methanol / Ambient temperature 2: 1) POCl3; 2) (Bu3NH)4P2O7, Bu3N / 1) PO(OMe)3, 4 deg C, 3 h; 2) DMF, 0 deg C, 1 min View Scheme

tributyl-amine; tri(n-butyl)ammonium pyrophosphate; trichlorophosphate 1) PO(OMe)3, 4 deg C, 3 h; 2) DMF, 0 deg C, 1 min; Yield given. Multistep reaction;