di-isopropyl azodicarboxylate; triphenylphosphine in tetrahydrofuran T=20°C; 13 h;

sodium tetrahydroborate; 18-crown-6 ether; dihydrogen peroxide; sodium methylate; titanium(III) chloride 1.) THF, 30 deg C, 20 h, 2.) THF, methanol, 40 deg C; Yield given. Multistep reaction. Yields of byproduct given;