[Synthesis]
Step 1: Preparation of allylsilane ether: add phenylacetone (1 g, 8 mmol) to a 50 mL two-necked flask, and cool the solution to 0 ℃ under nitrogen protection, then add 10 mL of anhydrous THF solution, then add lithium diisopropylammonium (2 mol/L, 4.2 |