1.1: 63 percent / K2CO3; org. peroxide / benzene / 20 °C 2.1: t-BuLi; lithium 2-thienylcyanocuprate / diethyl ether; tetrahydrofuran / -78 - -10 °C 2.2: 91 percent / diethyl ether; tetrahydrofuran / -78 - -30 °C 3.1: 99 percent / aq. TsOH / acetone / Heating 4.1: 82 percent / Cs2CO3 / acetonitrile / Heating 5.1: DIBAL-H / CH2Cl2 / -78 °C 5.2: KH; CS2; MeI / tetrahydrofuran / 20 °C 5.3: n-Bu3SnH; AIBN / benzene / Heating 6.1: 98 percent / TBAF / tetrahydrofuran / Heating 7.1: O2; Rose bengal; DIPEA / CH2Cl2 / -78 °C / Irradiation 7.2: 61 percent / NaBH4; H2O / CH2Cl2 / 20 °C View Scheme