Multi-step reaction with 7 steps
1.1: NaH / diethyl ether / 0 - 20 °C
1.2: acetyl bromide / diethyl ether; CH2Cl2 / 60 °C
1.3: 256 mg / tetrahydrofuran / 60 °C
2.1: 75 percent / DMAP; Et3N / CH2Cl2 / 10 h / 20 °C
3.1: Zn; 1,2-dibromoethane; chlorotrimethylsilyl chloride / tetrahydrofuran; N,N-dimethyl-acetamide / 1 h / sonnication
3.2: 66 percent / Pd2(dba)2*CHCl3; tri-o-tolylphosphine / tetrahydrofuran; N,N-dimethyl-acetamide / 2 h / 55 °C
4.1: 86 percent / TBAF / tetrahydrofuran
5.1: 60 percent / pyridine / CH2Cl2 / 0 - 20 °C
6.1: 95 percent / triethylamine; formic acid; dppf / Pd(OAc02 / dimethylformamide / 6 h / 70 °C
7.1: 65 percent / ozone / CH2Cl2 / 0.17 h / -78 °C
With
pyridine; dmap; 1,1'-bis-(diphenylphosphino)ferrocene; formic acid; chlorotrimethylsilyl chloride; tetrabutyl ammonium fluoride; sodium hydride; ozone; ethylene dibromide; triethylamine; zinc;
palladium diacetate;
In
tetrahydrofuran; diethyl ether; dichloromethane; N,N-dimethyl acetamide; N,N-dimethyl-formamide;
DOI:10.1021/jo050363n