Multi-step reaction with 5 steps
1: 1.) lithium diisopropylamide / 1.) THF, -20 deg C, 15 min, 2a.) -20 deg C, 1.5 h, 2b.) -10 deg C, 0.5 h
2: 1.) lithium diisopropylamide / 1.) THF, -78 deg C, 1 h, 2a.) -78 deg C, 2 h, 2b.) -40 deg C, 1 h, 2c.) 25 deg C, 16 h
3: 36 percent / NaBH4 / methanol / 3 h / 25 °C
4: 1.) lithium diisopropylamide, 2.) water / THF
5: 1.) lithium diisopropylamide / 1a.) THF, -78 deg C, 1 h, 1b.) -60 deg C, 1 h, 2a.) -78 deg C, 1 h, 2b.) 25 deg C, 1 h
With
sodium tetrahydroborate; water; lithium diisopropyl amide;
In
methanol;
DOI:10.1055/s-1991-26620