Multi-step reaction with 9 steps
1: 69 percent / ZnI2 / 15 h / 140 °C
2: 1.) n-BuLi, 2.) Et3SiH, BF3*Et2O / 1.) THF, -75 deg C, 3 h, -75 deg C -> 0 deg C, 4 h, 2.) CH2Cl2, -75 deg C -> rt, overnight
3: 67 percent / pyridine / 4.5 h / Ambient temperature
4: 81 percent / BBr3 / CH2Cl2 / 5 h / -75 °C
5: 84 percent / pyridine / 4 h / Ambient temperature
6: 74 percent / dimethylformamide / rt, 1h, 40 deg C, 3.5 h
7: 67 percent / AIBN, SiH(SiMe3)2 / toluene / 5 h / 80 °C
8: 93 percent / Bu4NF / tetrahydrofuran / 1.5 h / Ambient temperature
9: 74 percent / pyridine / 2 h
With
triethylsilane; n-butyllithium; 2,2'-azobis(isobutyronitrile); 1,1,1,3,3,3-hexamethyltrisilane; boron trifluoride diethyl etherate; tetrabutyl ammonium fluoride; boron tribromide; zinc(II) iodide;
In
tetrahydrofuran; pyridine; dichloromethane; N,N-dimethyl-formamide; toluene;
DOI:10.1021/ja9704904