Multi-step reaction with 7 steps
1.1: 90 percent / N,N-diisopropylethylamine / CH2Cl2 / 96 h / 20 °C
2.1: 95 percent / H2 / Rh/Al2O3 / ethyl acetate / 24 h / 20 °C
3.1: 73 percent / aq. AcOH / 24 h / 20 °C
4.1: trimethyl orthoformate; pyridinium p-toluenesulfonate / CH2Cl2 / 24 h / 20 °C
4.2: 87 percent / Ac2O / 2 h / 135 - 140 °C
5.1: 89 percent / 2,6-dichloro-3,4-dicyano-p-benzoquionone / CH2Cl2; H2O / 1.5 h / 0 °C
6.1: pyridine / CH2Cl2 / 2.5 h / 0 - 20 °C
6.2: 78 percent / triethylamine / CH2Cl2 / 0.83 h / 0 - 20 °C
7.1: 86 percent / tributyltin hydride; 2,2'-azobisisobutyronitrile / toluene / 1.5 h / 100 - 110 °C
With
pyridine; 2,2'-azobis(isobutyronitrile); hydrogen; tri-n-butyl-tin hydride; pyridinium p-toluenesulfonate; 2,6-dichloro-3,5-dicyano-1,4-benzoquinone; acetic acid; N-ethyl-N,N-diisopropylamine; trimethyl orthoformate;
Rh/Al2O3;
In
dichloromethane; water; ethyl acetate; toluene;
DOI:10.1021/jo020211h