All reactions were carried with dry solvents unless otherwise stated. Reagents were purchased at the highest commercial quality and used without further purification, unless stated otherwise. Thin-layer chromatography was performed using silica gel plates 60 F254: Visualization was accomplished with short wavelength ultraviolet (UV) light (254 nm) and near UV light (366 nm) sources. Standard flash chromatography was performed on a Biotage® IsoleraTM Spektra system automated with high performance flash purification system using silica gel 60 M (particle size 40-63 μm, 230-440 mesh, Merck) or using forced flow chromatography (FC) on silica gel (35-70 mesh). Organic solutions were concentrated under reduced pressure on a Büchi rotary evaporator (in vacuo at 40 °C, ca. 5 mbar).