1: 39 percent / triethyl phosphite / 0.5 h / Heating 2: 67 percent / 1 M tetra-n-butylammonium fluoride / tetrahydrofuran View Scheme

1: 39 percent / triethyl phosphite / 0.5 h / Heating 2: 67 percent / 1 M tetra-n-butylammonium fluoride / tetrahydrofuran 3: 78 percent / H2 / 10percent Pd/C / ethanol; H2O / 6 h / 2585.7 Torr View Scheme

With  triethyl phosphite 0.5 h;  Heating;