1: K2CO3 / dimethylformamide / 3 h / 155 - 160 °C 2: 89 percent / sodium tetrahydroborate / H2O; methanol / 0.5 h 3: 85 percent / pyridine, thionylchloride / diethyl ether / 3 h / Ambient temperature 4: 62 percent View Scheme

1: 72 percent / K2CO3 / dimethylformamide / 3 h / 155 - 160 °C 2: 89 percent / sodium tetrahydroborate / H2O; methanol / 0.5 h 3: 85 percent / pyridine, thionylchloride / diethyl ether / 3 h / Ambient temperature 4: 62 percent View Scheme

1: K2CO3 / dimethylformamide / 3 h / 155 - 160 °C 2: 89 percent / sodium tetrahydroborate / H2O; methanol / 0.5 h 3: 85 percent / pyridine, thionylchloride / diethyl ether / 3 h / Ambient temperature 4: 62 percent View Scheme

1: 89 percent / sodium tetrahydroborate / H2O; methanol / 0.5 h 2: 85 percent / pyridine, thionylchloride / diethyl ether / 3 h / Ambient temperature 3: 62 percent View Scheme

1: 85 percent / pyridine, thionylchloride / diethyl ether / 3 h / Ambient temperature 2: 62 percent View Scheme

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