Unless stated otherwise, reagents were obtained from commercial
sources, such as Sigma-Aldrich (Chemie GmbH, Taufkirchen, Germany),
and used without further purification. The synthesized compounds were
fully characterized. Thin-layer chromatography (TLC) was performed
on Merck silica gel 60 F254, 20 × 20 cm plates, and visualized
using a 254 nm UV lamp. A standard rotary evaporator was used for
vacuumed removal of the solvents. 1H and 13C
NMR spectra were recorded in CDCl3 and DMSO-d6 on a JEOL spectrometer (JEOL, Tokyo, Japan) (400 or
500 MHz). Infrared spectra were recorded on a Thermo Scientific Nicolet
iS10 FT-IR spectrometer (Thermo Fisher Scientific, Waltham, MA, USA).
X-ray diffraction data were collected on a Rigaku Oxford Diffraction
Supernova diffractometer and processed with CrysAlisPro software v.
1.171.41.93a (Rigaku Oxford Diffraction, Yarnton, UK, 2020) using
Cu Kα radiation.
sources, such as Sigma-Aldrich (Chemie GmbH, Taufkirchen, Germany),
and used without further purification. The synthesized compounds were
fully characterized. Thin-layer chromatography (TLC) was performed
on Merck silica gel 60 F254, 20 × 20 cm plates, and visualized
using a 254 nm UV lamp. A standard rotary evaporator was used for
vacuumed removal of the solvents. 1H and 13C
NMR spectra were recorded in CDCl3 and DMSO-d6 on a JEOL spectrometer (JEOL, Tokyo, Japan) (400 or
500 MHz). Infrared spectra were recorded on a Thermo Scientific Nicolet
iS10 FT-IR spectrometer (Thermo Fisher Scientific, Waltham, MA, USA).
X-ray diffraction data were collected on a Rigaku Oxford Diffraction
Supernova diffractometer and processed with CrysAlisPro software v.
1.171.41.93a (Rigaku Oxford Diffraction, Yarnton, UK, 2020) using
Cu Kα radiation.