1: acetonitrile / 18 h 2: 1.65 g / NaBH4 / methanol / 3 h / 20 °C 3: 75 percent / TFA / 0.5 h / 20 °C View Scheme

1-methyl-piperidine; hydrogen; triphenylphosphine; platinum on activated charcoal Yield given. Multistep reaction. Yields of byproduct given;