1: pyridine 2: NaIO4 / methanol; H2O 3: 1.) LDA; 2.) glacial acetic acid / 1.) THF, -78 to RT, 10 h; 2.) THF, RT, 1 h 4: 73 percent / Al/Hg / tetrahydrofuran; H2O View Scheme

Multi-step reaction with 2 steps 1: pyridine2: NaIO4 / methanol; H2O  

Multi-step reaction with 3 steps 1: pyridine2: NaIO4 / methanol; H2O3: 1.) LDA; 2.) glacial acetic acid / 1.) THF, -78 to RT, 10 h; 2.) THF, RT, 1 h