S3
General methods:Chromatography: Merck silica gel type 9385 230-400 mesh, TLC: Merck silica gel 60, 0.25 mm. Components were visualized by UV and cerium/molybdenum or potassium permanganate staining. Progress and conversion of the reaction were determined by GC-MS (GC, HP6890: MS HP5973) with an HP1 or HP5 column (Agilent Technologies, Palo Alto, CA). Mass spectra were recorded on an AEI-MS-902 mass spectrometer (EI+) or a LTQ Orbitrap XL (ESI+). 1 H-and 13 C-NMR were recorded on a Varian AMX400 (400 and 100.59 MHz, respectively) using CDCl 3 as solvent. Chemical shift values are reported in ppm with the solvent resonance as the internal standard (CHCl 3 : 7.26 for 1 H, 77.0 for 13 C). Data are reported as follows: chemical shifts, multiplicity (s = singlet, d = doublet, t = triplet, q = quartet, br = broad, m = multiplet), coupling constants (Hz), and integration. Carbon assignments are based on APT 13 C-NMR experiments. Melting points were measured using a Büchi Melting Point B-545. All reactions were carried out under a nitrogen atmosphere using oven dried glassware and using standard Schlenk techniques. Dichloromethane was dried and distilled over calcium hydride; THF, Et 2 O and toluene were dried and distilled over sodium. Pd[P( t Bu) 3 ] 2 , was purchased from strem, Pd 2 (dba) 3 , SPhos, XPhos, DavePhos and P( t Bu) 3 were purchased from Aldrich and used without further purification. n BuLi (1.6 M solution in hexane) and PhLi (2.0 M solution in dibutylether) were purchased from Acros. sec BuLi (1.4 M in cyclohexane), MeLi (1.6 M in diethylether), TMSCH 2 Li (1.0 M in pentane), HexLi (2.3 M in hexane), thienylLi (1.0 M in THF/hexane), tert BuLi (1.7 M in pentane) and the compounds used as precursor for the preparation of lithium reagents, namely furan, 1-bromo-2,6-dimethyl-benzene and 1-bromobenzene-3-trifluoromethyl-benzene were purchased from Aldrich. All the bromides were commercially available and were purchased from Aldrich with the exception of 2-bromo-5-phenylthiophene (Maybridge) and 2-(4-bromophenyl)-1,3-dioxolane (Acros). Organolithium other than the aforementioned were prepared according to described procedures (see below).