1: 95 percent / Et3N 2: 98 percent / 10 percent HCl / tetrahydrofuran 3: HN(SiMe3)2 5: DBU / 2-methyl-propan-2-ol / Heating 6: H2 / Raney Ni 7: 80 percent / Mg(OTf)2 8: 73 percent / CHCl3 9: 1.) Et3O(1+)*BF4(1-), Na2CO3; 2.) HOAc / 1.) THF, CH2Cl2 10: 80 percent / ethanol 11: methanolic sodium methoxide / benzene 12: Et3N / CHCl3 / 100 °C / sealed tube View Scheme