1: 4-bromo-2-cyclopentyloxy-1-methoxy-benzene With n-butyllithium in diethyl ether; hexane T=-78°C; 1 h; 2: boric acid trimethyl ester in diethyl ether; hexane T=-78°C; 1 h;

1.1: n-BuLi / diethyl ether; hexane / 1 h / -78 °C 1.2: diethyl ether; hexane / 1 h / -78 °C 2.1: 88 percent / Na2CO3; O2 / Pd(OAc)2 / dimethylformamide / 12 h / 50 °C / 760 Torr 3.1: 90 percent / NBS; AIBN / CCl4 / 10 h / Heating 4.1: 99 percent / NaN3 / ethanol; H2O / 8 h / Heating 5.1: NaBH4; [4(S)-Ph-oxazolidin-2-ylidene][4(S)-Ph-2-oxazolin-2-yl](CN)C / CoCl2*6H2O / ethanol; dimethylformamide / 24 h / 25 °C View Scheme