In(ONf)3 in anhydrous butyl ether T=70°C; 40 h; Schlenk techniqueInert atmosphere; Overall yield = 44 percent;

triethyl borane; tri-n-butyl-tin hydride in hexane; toluene T=20°C; 24 h;

3 A molecular sieve; palladium on activated charcoal in acetic acid 48 h; Heating;

1: 63 percent / triethylamine; 4-(dimethylamino)pyridine / tetrahydrofuran 2: 79 percent / (PPh3)2PdCl2; triethylamine; CuI / dimethylformamide / -78 - 20 °C 3: COCl2; DMF / CH2Cl2; toluene / 0 - 20 °C 4: K-selectride / tetrahydrofuran / 20 °C 5: 15 percent / tributyltin hydride; triethylborane / toluene; hexane / 24 h / 20 °C View Scheme