Multi-step reaction with 9 steps
1.1: n-BuLi / tetrahydrofuran / -10 - 25 °C
2.1: NaH / tetrahydrofuran / 1 h / 0 °C
2.2: tetrahydrofuran / 0 - 20 °C
3.1: Et3N; pivaloyl chloride / diethyl ether / 1 h / 0 °C
3.2: n-BuLi / tetrahydrofuran; hexane; diethyl ether / 2 h / 0 °C
4.1: 74 percent / TiCl4; i-Pr2NEt; N-methyl-2-pyrrolidinone / CH2Cl2 / -78 - -40 °C
5.1: 91 percent / 4-(dimethylamino)-pyridine; DIEA / CH2Cl2 / 72 h / 20 °C
6.1: 95 percent / LiBH4; MeOH / diethyl ether / 2 h / 0 °C
7.1: oxalyl chloride; dimethylsulfoxide; Et3N / CH2Cl2 / 0.25 h / -78 - 0 °C
8.1: t-BuOK / tetrahydrofuran; toluene / 1 h / 0 °C
8.2: 90 percent / tetrahydrofuran; toluene / 2 h / 20 °C
9.1: Cl2(Cy3P)(IMes)Ru=CHPh / CH2Cl2 / 8 h / Heating
With
1-methyl-pyrrolidin-2-one; methanol; dmap; lithium borohydride; Cl2(PCy3)(N,N'-(Mes)2-imidazolidin-2-yl)Ru=CHC6H5; n-butyllithium; oxalyl dichloride; potassium tert-butylate; pivaloyl chloride; titanium tetrachloride; sodium hydride; dimethyl sulfoxide; triethylamine; N-ethyl-N,N-diisopropylamine;
In
tetrahydrofuran; diethyl ether; dichloromethane; toluene;
DOI:10.1021/ja0455852