Upon completion, the mixture was extracted with EtOAc two times, the combined S51 organic layers were dried over anhydrous Na2SO4 and concentrated under reduced pressure. The crude mixture was analyzed by H NMR with 1,3,5-trimethoxybenzene as internal standard to determine the yield. Under N2 atmosphere, an oven-dried Schlenk-tube equipped with a magnetic stir bar 3.12 2.08 0.98 1.99 2.00 13 C NMR spectrum of compound 14