1: DCC, phosphoric acid / 1,2-dimethoxy-ethane / a) 18 deg C, 30 min, b) RT, 2 h 2: 1.) NaH / 1.) DME, RT, 1 h, 2.) DME, a) 0 deg C, 30 min, b) RT, 2 h 3: 33.1 percent / lithium tri-sec-butylborohydride (lithium selectride) / tetrahydrofuran; diethyl ether / 1 h / -78 - -75 °C 4: 65 percent / H2, 1 M NaOH / 10percent Pd/C / ethanol / 6 h 5: 83.6 percent / K2CO3 / methanol / 6 h / Ambient temperature 6: 83 percent / diisobutylaluminium hydride (DIBAL) / toluene; tetrahydrofuran / 1 h / -80 - -72 °C 7: 1.) t-BuOK / 1.) THF, RT, 30 min, 2.) THF, -15 to -10 deg C, 4 h View Scheme

1: 1.) NaH, 2.) n-BuLi 2: 1.) NaH / 1.) DME, RT, 1 h, 2.) DME, a) 0 deg C, 30 min, b) RT, 2 h 3: 33.1 percent / lithium tri-sec-butylborohydride (lithium selectride) / tetrahydrofuran; diethyl ether / 1 h / -78 - -75 °C 4: 65 percent / H2, 1 M NaOH / 10percent Pd/C / ethanol / 6 h 5: 83.6 percent / K2CO3 / methanol / 6 h / Ambient temperature 6: 83 percent / diisobutylaluminium hydride (DIBAL) / toluene; tetrahydrofuran / 1 h / -80 - -72 °C 7: 1.) t-BuOK / 1.) THF, RT, 30 min, 2.) THF, -15 to -10 deg C, 4 h View Scheme

1: 33.1 percent / lithium tri-sec-butylborohydride (lithium selectride) / tetrahydrofuran; diethyl ether / 1 h / -78 - -75 °C 2: 65 percent / H2, 1 M NaOH / 10percent Pd/C / ethanol / 6 h 3: 83.6 percent / K2CO3 / methanol / 6 h / Ambient temperature 4: 83 percent / diisobutylaluminium hydride (DIBAL) / toluene; tetrahydrofuran / 1 h / -80 - -72 °C 5: 1.) t-BuOK / 1.) THF, RT, 30 min, 2.) THF, -15 to -10 deg C, 4 h View Scheme

1: 65 percent / H2, 1 M NaOH / 10percent Pd/C / ethanol / 6 h 2: 83.6 percent / K2CO3 / methanol / 6 h / Ambient temperature 3: 83 percent / diisobutylaluminium hydride (DIBAL) / toluene; tetrahydrofuran / 1 h / -80 - -72 °C 4: 1.) t-BuOK / 1.) THF, RT, 30 min, 2.) THF, -15 to -10 deg C, 4 h View Scheme

1: 1.) NaH / 1.) DME, RT, 1 h, 2.) DME, a) 0 deg C, 30 min, b) RT, 2 h 2: 33.1 percent / lithium tri-sec-butylborohydride (lithium selectride) / tetrahydrofuran; diethyl ether / 1 h / -78 - -75 °C 3: 65 percent / H2, 1 M NaOH / 10percent Pd/C / ethanol / 6 h 4: 83.6 percent / K2CO3 / methanol / 6 h / Ambient temperature 5: 83 percent / diisobutylaluminium hydride (DIBAL) / toluene; tetrahydrofuran / 1 h / -80 - -72 °C 6: 1.) t-BuOK / 1.) THF, RT, 30 min, 2.) THF, -15 to -10 deg C, 4 h View Scheme

1: 83 percent / diisobutylaluminium hydride (DIBAL) / toluene; tetrahydrofuran / 1 h / -80 - -72 °C 2: 1.) t-BuOK / 1.) THF, RT, 30 min, 2.) THF, -15 to -10 deg C, 4 h View Scheme

1: 83.6 percent / K2CO3 / methanol / 6 h / Ambient temperature 2: 83 percent / diisobutylaluminium hydride (DIBAL) / toluene; tetrahydrofuran / 1 h / -80 - -72 °C 3: 1.) t-BuOK / 1.) THF, RT, 30 min, 2.) THF, -15 to -10 deg C, 4 h View Scheme

potassium tert-butylate 1.) THF, RT, 30 min, 2.) THF, -15 to -10 deg C, 4 h; Multistep reaction;