Multi-step reaction with 5 steps
1: 1N aq. NaOH / ethanol / 48 h / Ambient temperature
2: 16.85 g / Cu2O / acetonitrile / 6 h / 80 °C
3: triethylamine / tetrahydrofuran / 0.58 h / -15 - 0 °C
4: 1.) n-butyllithium / 1.) THF, hexane, - 60 deg C, 2.) THF, hexane, -78 deg C, 1 h
5: 1.) potassium bis(trimethylsilyl)amide, 2.) 2,4,6-triisopropylbenzenesulfonyl azide / 1.) THF, toluene, -78 deg C, 30 min, 2.) THF, toluene, -75 deg C, 2 min
With
copper(I) oxide; sodium hydroxide; n-butyllithium; 2,4,6-Triisopropylbenzenesulfonyl azide; potassium hexamethylsilazane; triethylamine;
In
tetrahydrofuran; ethanol; acetonitrile;
DOI:10.1021/jm00068a006