trichlorophosphate 1.) 30 deg C, 30 min; 2.) 6 h;

Multi-step reaction with 2 steps 1: 1.) LDA, 2.) MgBr2 / 1.) THF, -78 deg C, 0.5 h, 2.) -78 deg C, 1 h2: 2) Li / 1) ether, -60 deg C, 4 h, 2) to 20 deg C, overnight