Multi-step reaction with 7 steps
1: 1.) Pd(PPh3)2Cl2, Et3N, CuI / 1.) THF, 20 min, 2.) THF, room temperature, overnight
2: 1.) Et3N, Pd(PPh3)2Cl2, CuI / 1.) THF, 2.) THF
3: 94 percent / Et3N / CH2Cl2 / Ambient temperature
4: 97 percent / aq. NaOH / tetrahydrofuran / 1 h
5: 91 percent / aq. AcOH / tetrahydrofuran / Ambient temperature
6: 1.) oxalyl chloride, DMSO, 2.) Et3N / 1.) CH2Cl2, -78 deg C, 25 min, 2.) CH2Cl2, -78 deg C, 1 h
7: 1.) DBU, LiCl / 1.) MeCN, room temperature, 15 min, 2.) MeCN, 1 min
With
bis-triphenylphosphine-palladium(II) chloride; sodium hydroxide; copper(l) iodide; oxalyl dichloride; acetic acid; dimethyl sulfoxide; 1,8-diazabicyclo[5.4.0]undec-7-ene; triethylamine; lithium chloride;
In
tetrahydrofuran; dichloromethane;
DOI:10.1021/jo961049j