samarium diiodide in tetrahydrofuran T=65°C; 4 h;

in tetrahydrofuran T=20°C; 2 h; Further byproducts given. Title compound not separated from byproducts;

Multi-step reaction with 3 steps 1: 70 percent / NaCNBH3; 2N HCl / CH2Cl2; methanol / 20 h / pH 32: 95 percent / DMAP / CH2Cl2; pyridine / 2 h3: H2 / Pd/BaSO4 / methanol / 2 h