4.1.1. General considerations
H NMR spectra were recorded on an instrument operating at 400 MHz and 13 C NMR spectra at 100 MHz and DMSO-d6 used as solvent unless otherwise stated. The chemical shifts are given in ppm relative to internal tetramethylsilane (TMS) and coupling constants (J) in Hz. IR were recorded on a Bruker FT-IR Tensor 27.Samples were measured as KBr disks, and themain bands are given in cm1. Mass spectra were recorded under electrospray ionization(ESI) and HRMS spectra were obtained in the University of Vigo or at Raidt e University of Santiago de Compostela. Melting points were measured on an EZ-Melt automated melting point apparatus and are uncorrected. Flash chromatography was performed with
Fluka silica gel Kieselfel G.