1: 91 percent / LDA / tetrahydrofuran / 0.5 h / -78 °C 3: 1) LDA / 1) -78 deg C 4: 94 percent / Et3N / (Ph3P)2PdCl2 / 75 °C 5: H2, Lindlar catalyst, quinoline / hexane 6: 2,2,4-trimethyl-pentane / Heating 7: 82 percent / ion-exchange resin AG 50W-X4 / methanol / 48 h / Ambient temperature; in the dark View Scheme