Multi-step reaction with 5 steps
1: I2, PPh3, imidazole / diethyl ether; acetonitrile / 0 °C
2: 1.) LDA, 2.) N,N'-dimethylpropyleneurea / 1.) THF, -78 deg C, 50 min, 2.) -78 deg C, 5 min; -42 deg C, 3 h; -42 deg C to room temperature
3: 66 percent / TFA / CH2Cl2 / 1.) 0 deg C, 2.5 h, 2.) room temperature, 2.5 h
4: 99 percent / oxalyl chloride, DMF / CH2Cl2 / 2 h / Ambient temperature
5: 1.) n-BuLi / 1.) THF, -78 deg C, 20 min, 2.) THF, -78 deg C, 2.5 h; -78 deg C to room temperature
With
1H-imidazole; 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone; n-butyllithium; oxalyl dichloride; iodine; N,N-dimethyl-formamide; triphenylphosphine; trifluoroacetic acid; lithium diisopropyl amide;
In
diethyl ether; dichloromethane; acetonitrile;
DOI:10.1021/jo961533m