1.1: 82 percent / LiAlH4 / diethyl ether / 24 h / Heating 2.1: 100 percent / DMAP / pyridine / 16 h / 20 °C 3.1: 66 percent / PPL / dimethylsulfoxide; aq. phosphate buffer / 2.5 h / 20 °C / pH 7.8 4.1: 100 percent / imidazole / dimethylformamide / 7 h / 20 °C 5.1: 100 percent / K2CO3 / methanol / 1.5 h / 20 °C 6.1: 100 percent / oxalyl chloride; DMSO; Et3N / CH2Cl2 / -78 - -40 °C 7.1: 90 percent / NaOMe / methanol / 20 °C 8.1: 93 percent / i-Pr2NEt / CH2Cl2 / 0 - 20 °C 9.1: 95 percent / 2-methyl-2-butene; NaClO2; NaH2PO4 / 2-methyl-propan-2-ol; H2O / 20 °C 10.1: CDI / tetrahydrofuran / 3 h / 20 °C 10.2: 20 percent / KHMDS / tetrahydrofuran; toluene / 7 h / 0 - 20 °C 11.1: CDI / tetrahydrofuran / 3 h / 20 °C 11.2: 64 percent / n-BuLi / tetrahydrofuran; hexane / 4.5 h / -78 °C 12.1: 85 percent / CuCN / tetrahydrofuran / 3.5 h / 10 °C 13.1: TBAF / tetrahydrofuran / 5 h / 40 - 50 °C 13.2: 62 percent / benzene; CHCl3 / Heating 14.1: 65 percent / MgBr2*OEt2 / benzene; diethyl ether / 11 h / 0 - 20 °C View Scheme

1.1: 66 percent / PPL / dimethylsulfoxide; aq. phosphate buffer / 2.5 h / 20 °C / pH 7.8 2.1: 100 percent / imidazole / dimethylformamide / 7 h / 20 °C 3.1: 100 percent / K2CO3 / methanol / 1.5 h / 20 °C 4.1: 100 percent / oxalyl chloride; DMSO; Et3N / CH2Cl2 / -78 - -40 °C 5.1: 90 percent / NaOMe / methanol / 20 °C 6.1: 93 percent / i-Pr2NEt / CH2Cl2 / 0 - 20 °C 7.1: 95 percent / 2-methyl-2-butene; NaClO2; NaH2PO4 / 2-methyl-propan-2-ol; H2O / 20 °C 8.1: CDI / tetrahydrofuran / 3 h / 20 °C 8.2: 20 percent / KHMDS / tetrahydrofuran; toluene / 7 h / 0 - 20 °C 9.1: CDI / tetrahydrofuran / 3 h / 20 °C 9.2: 64 percent / n-BuLi / tetrahydrofuran; hexane / 4.5 h / -78 °C 10.1: 85 percent / CuCN / tetrahydrofuran / 3.5 h / 10 °C 11.1: TBAF / tetrahydrofuran / 5 h / 40 - 50 °C 11.2: 62 percent / benzene; CHCl3 / Heating 12.1: 65 percent / MgBr2*OEt2 / benzene; diethyl ether / 11 h / 0 - 20 °C View Scheme

1.1: 100 percent / imidazole / dimethylformamide / 7 h / 20 °C 2.1: 100 percent / K2CO3 / methanol / 1.5 h / 20 °C 3.1: 100 percent / oxalyl chloride; DMSO; Et3N / CH2Cl2 / -78 - -40 °C 4.1: 90 percent / NaOMe / methanol / 20 °C 5.1: 93 percent / i-Pr2NEt / CH2Cl2 / 0 - 20 °C 6.1: 95 percent / 2-methyl-2-butene; NaClO2; NaH2PO4 / 2-methyl-propan-2-ol; H2O / 20 °C 7.1: CDI / tetrahydrofuran / 3 h / 20 °C 7.2: 20 percent / KHMDS / tetrahydrofuran; toluene / 7 h / 0 - 20 °C 8.1: CDI / tetrahydrofuran / 3 h / 20 °C 8.2: 64 percent / n-BuLi / tetrahydrofuran; hexane / 4.5 h / -78 °C 9.1: 85 percent / CuCN / tetrahydrofuran / 3.5 h / 10 °C 10.1: TBAF / tetrahydrofuran / 5 h / 40 - 50 °C 10.2: 62 percent / benzene; CHCl3 / Heating 11.1: 65 percent / MgBr2*OEt2 / benzene; diethyl ether / 11 h / 0 - 20 °C View Scheme

1.1: 93 percent / i-Pr2NEt / CH2Cl2 / 0 - 20 °C 2.1: 95 percent / 2-methyl-2-butene; NaClO2; NaH2PO4 / 2-methyl-propan-2-ol; H2O / 20 °C 3.1: CDI / tetrahydrofuran / 3 h / 20 °C 3.2: 20 percent / KHMDS / tetrahydrofuran; toluene / 7 h / 0 - 20 °C 4.1: CDI / tetrahydrofuran / 3 h / 20 °C 4.2: 64 percent / n-BuLi / tetrahydrofuran; hexane / 4.5 h / -78 °C 5.1: 85 percent / CuCN / tetrahydrofuran / 3.5 h / 10 °C 6.1: TBAF / tetrahydrofuran / 5 h / 40 - 50 °C 6.2: 62 percent / benzene; CHCl3 / Heating 7.1: 65 percent / MgBr2*OEt2 / benzene; diethyl ether / 11 h / 0 - 20 °C View Scheme

1.1: 90 percent / NaOMe / methanol / 20 °C 2.1: 93 percent / i-Pr2NEt / CH2Cl2 / 0 - 20 °C 3.1: 95 percent / 2-methyl-2-butene; NaClO2; NaH2PO4 / 2-methyl-propan-2-ol; H2O / 20 °C 4.1: CDI / tetrahydrofuran / 3 h / 20 °C 4.2: 20 percent / KHMDS / tetrahydrofuran; toluene / 7 h / 0 - 20 °C 5.1: CDI / tetrahydrofuran / 3 h / 20 °C 5.2: 64 percent / n-BuLi / tetrahydrofuran; hexane / 4.5 h / -78 °C 6.1: 85 percent / CuCN / tetrahydrofuran / 3.5 h / 10 °C 7.1: TBAF / tetrahydrofuran / 5 h / 40 - 50 °C 7.2: 62 percent / benzene; CHCl3 / Heating 8.1: 65 percent / MgBr2*OEt2 / benzene; diethyl ether / 11 h / 0 - 20 °C View Scheme

1.1: 100 percent / oxalyl chloride; DMSO; Et3N / CH2Cl2 / -78 - -40 °C 2.1: 90 percent / NaOMe / methanol / 20 °C 3.1: 93 percent / i-Pr2NEt / CH2Cl2 / 0 - 20 °C 4.1: 95 percent / 2-methyl-2-butene; NaClO2; NaH2PO4 / 2-methyl-propan-2-ol; H2O / 20 °C 5.1: CDI / tetrahydrofuran / 3 h / 20 °C 5.2: 20 percent / KHMDS / tetrahydrofuran; toluene / 7 h / 0 - 20 °C 6.1: CDI / tetrahydrofuran / 3 h / 20 °C 6.2: 64 percent / n-BuLi / tetrahydrofuran; hexane / 4.5 h / -78 °C 7.1: 85 percent / CuCN / tetrahydrofuran / 3.5 h / 10 °C 8.1: TBAF / tetrahydrofuran / 5 h / 40 - 50 °C 8.2: 62 percent / benzene; CHCl3 / Heating 9.1: 65 percent / MgBr2*OEt2 / benzene; diethyl ether / 11 h / 0 - 20 °C View Scheme

1.1: 100 percent / K2CO3 / methanol / 1.5 h / 20 °C 2.1: 100 percent / oxalyl chloride; DMSO; Et3N / CH2Cl2 / -78 - -40 °C 3.1: 90 percent / NaOMe / methanol / 20 °C 4.1: 93 percent / i-Pr2NEt / CH2Cl2 / 0 - 20 °C 5.1: 95 percent / 2-methyl-2-butene; NaClO2; NaH2PO4 / 2-methyl-propan-2-ol; H2O / 20 °C 6.1: CDI / tetrahydrofuran / 3 h / 20 °C 6.2: 20 percent / KHMDS / tetrahydrofuran; toluene / 7 h / 0 - 20 °C 7.1: CDI / tetrahydrofuran / 3 h / 20 °C 7.2: 64 percent / n-BuLi / tetrahydrofuran; hexane / 4.5 h / -78 °C 8.1: 85 percent / CuCN / tetrahydrofuran / 3.5 h / 10 °C 9.1: TBAF / tetrahydrofuran / 5 h / 40 - 50 °C 9.2: 62 percent / benzene; CHCl3 / Heating 10.1: 65 percent / MgBr2*OEt2 / benzene; diethyl ether / 11 h / 0 - 20 °C View Scheme

1.1: 95 percent / 2-methyl-2-butene; NaClO2; NaH2PO4 / 2-methyl-propan-2-ol; H2O / 20 °C 2.1: CDI / tetrahydrofuran / 3 h / 20 °C 2.2: 20 percent / KHMDS / tetrahydrofuran; toluene / 7 h / 0 - 20 °C 3.1: CDI / tetrahydrofuran / 3 h / 20 °C 3.2: 64 percent / n-BuLi / tetrahydrofuran; hexane / 4.5 h / -78 °C 4.1: 85 percent / CuCN / tetrahydrofuran / 3.5 h / 10 °C 5.1: TBAF / tetrahydrofuran / 5 h / 40 - 50 °C 5.2: 62 percent / benzene; CHCl3 / Heating 6.1: 65 percent / MgBr2*OEt2 / benzene; diethyl ether / 11 h / 0 - 20 °C View Scheme

1.1: CDI / tetrahydrofuran / 3 h / 20 °C 1.2: 20 percent / KHMDS / tetrahydrofuran; toluene / 7 h / 0 - 20 °C 2.1: CDI / tetrahydrofuran / 3 h / 20 °C 2.2: 64 percent / n-BuLi / tetrahydrofuran; hexane / 4.5 h / -78 °C 3.1: 85 percent / CuCN / tetrahydrofuran / 3.5 h / 10 °C 4.1: TBAF / tetrahydrofuran / 5 h / 40 - 50 °C 4.2: 62 percent / benzene; CHCl3 / Heating 5.1: 65 percent / MgBr2*OEt2 / benzene; diethyl ether / 11 h / 0 - 20 °C View Scheme

1.1: 85 percent / CuCN / tetrahydrofuran / 3.5 h / 10 °C 2.1: TBAF / tetrahydrofuran / 5 h / 40 - 50 °C 2.2: 62 percent / benzene; CHCl3 / Heating 3.1: 65 percent / MgBr2*OEt2 / benzene; diethyl ether / 11 h / 0 - 20 °C View Scheme