Multi-step reaction with 9 steps
1: dmap; trifluoroacetic anhydride; N-ethyl-N,N-diisopropylamine / dichloromethane / 18.25 h / 0 - 20 °C
2: triethylamine / tetrahydrofuran / 1 h / 0 °C
3: palladium diacetate / acetonitrile / 1.5 h / 20 °C
4: acetonitrile / 3 h / 20 °C / UV-irradiation; Inert atmosphere
5: palladium 10% on activated carbon; hydrogen / ethyl acetate / 0.5 h / 20 °C
6: orthoformic acid triethyl ester; toluene-4-sulfonic acid / dichloromethane / 20 °C
7: N,N,N,N,N,N-hexamethylphosphoric triamide; potassium; tert-butyl alcohol / diethyl ether / 16 h / 0 - 20 °C
8: pyridinium p-toluenesulfonate / acetone / 1.5 h / 20 °C
9: cerium(III) chloride / tetrahydrofuran / 16 h / -78 °C
With
N,N,N,N,N,N-hexamethylphosphoric triamide; dmap; cerium(III) chloride; palladium 10% on activated carbon; hydrogen; palladium diacetate; potassium; pyridinium p-toluenesulfonate; toluene-4-sulfonic acid; triethylamine; N-ethyl-N,N-diisopropylamine; orthoformic acid triethyl ester; trifluoroacetic anhydride; tert-butyl alcohol;
In
tetrahydrofuran; diethyl ether; dichloromethane; ethyl acetate; acetone; acetonitrile;
DOI:10.1021/acs.orglett.6b03635