tributylphosphine; methyl iodide 1.) THF, 1 h, 2.) THF, 1 h, 3.) THF, 5 min; Yield given. Multistep reaction;

1: 96 percent / tetrahydrofuran; diethyl ether / 0.5 h / -10 °C 2: 81 percent / Bu4NF / tetrahydrofuran / 3 h / Heating 3: Heating 4: 82 percent / m-chloroperbenzoic acid, KF / CH2Cl2 / 1 h 5: 1.) Ts-NH-NH2, 2.) (Ph3P)2CuBH4 / 1.) MeOH, reflux, 40 min, 2.) CHCl3, reflux, 4h View Scheme