Multi-step reaction with 6 steps
1: 52 percent / tetrahydrofuran / 12 h / -78 - 20 °C
3: 98 percent / imidazole / dimethylformamide / 12 h
4: 1.) n-BuLi / 1) THF, hexane, -78 deg C, 1 h; 2) THF, hexane, rt, 7 h
5: 1.) n-BuLi, Cp2TiCl2, 2.) N-iodosuccinimide / 1) hexane, THF, -55 deg C --> rt, rt, 7 h; 2) hexane, THF, Ch2Cl2, -50 deg C, 1 h, rt, 1 h
6: 70 percent / DBU / CH2Cl2 / 48 h / Ambient temperature
With
1H-imidazole; bis(cyclopentadienyl)titanium dichloride; N-iodo-succinimide; n-butyllithium; 1,8-diazabicyclo[5.4.0]undec-7-ene;
In
tetrahydrofuran; dichloromethane; N,N-dimethyl-formamide;
DOI:10.1021/jo970605m