1: methanesulfonyl azide; triethylamine / acetonitrile / 4 h / 20 °C 2: aqueous NaOH / 0.5 h View Scheme

1.1: NaH / tetrahydrofuran / 0.17 h / 0 °C 1.2: n-BuLi / tetrahydrofuran; hexane / 0.33 h / 0 °C 1.3: tetrahydrofuran; hexane / 0.5 h / 0 - 20 °C 2.1: methanesulfonyl azide; triethylamine / acetonitrile / 4 h / 20 °C 3.1: aqueous NaOH / 0.5 h View Scheme

1: (i) KOH, EtOH, H2O, (ii) Cu, quinoline, (heating) 2: (COCl)2 / petroleum ether 3: diethyl ether View Scheme

1: (COCl)2 / petroleum ether 2: diethyl ether View Scheme

1: (i) NaOEt, EtOH, (ii) /BRN= 878156/ 2: (i) KOH, EtOH, H2O, (ii) Cu, quinoline, (heating) 3: (COCl)2 / petroleum ether 4: diethyl ether View Scheme

in diethyl ether

copper in cyclohexane Heating;