in 1,4-dioxane 72 h; Heating; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

1)ether, 0-5 deg C, 2 h, then r.t. 1 day, 2) methanol, r.t. overnight; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;