NMR spectra
were recorded at room temperature
on Bruker 400 spectrometer and Bruker 600 spectrometer equipped with
a CryoProbe (Bruker BioSpin GmbH). HRMS spectra were recorded on a
Bruker MALDI-TOF, Bruker maXis ESI-QTOF spectrometer, and Bruker solariX
spectrometer (Bruker Daltonics GmbH). FT-IR spectra were recorded
on PerkinElmer Spectrum One FT-IR spectrometer with a universal ATR
sampling accessory (PerkinElmer Inc.). HPLC analyses were carried
out using JASCO PU-2080 Plus HPLC pump, JASCO MD2018 Plus detector,
and ChromNAV chromatography data system (JASCO, Co.). UV–vis
spectra were recorded on Varian Cary 500 Scan UV–vis NIR Spectrophotometer
(Varian Inc.). Column chromatography and analytical TLC were performed
on SilicaFlash F60 (230–400 mesh) (SiliCycle Inc.) and silica
gel 60 F254 TLC (Merck KGaA), respectively. All the solvents used
were HPLC grade and purchased from Acros Organic (Thermo Fischer Scientific,
Inc.). All used water were Milli-Q water.
were recorded at room temperature
on Bruker 400 spectrometer and Bruker 600 spectrometer equipped with
a CryoProbe (Bruker BioSpin GmbH). HRMS spectra were recorded on a
Bruker MALDI-TOF, Bruker maXis ESI-QTOF spectrometer, and Bruker solariX
spectrometer (Bruker Daltonics GmbH). FT-IR spectra were recorded
on PerkinElmer Spectrum One FT-IR spectrometer with a universal ATR
sampling accessory (PerkinElmer Inc.). HPLC analyses were carried
out using JASCO PU-2080 Plus HPLC pump, JASCO MD2018 Plus detector,
and ChromNAV chromatography data system (JASCO, Co.). UV–vis
spectra were recorded on Varian Cary 500 Scan UV–vis NIR Spectrophotometer
(Varian Inc.). Column chromatography and analytical TLC were performed
on SilicaFlash F60 (230–400 mesh) (SiliCycle Inc.) and silica
gel 60 F254 TLC (Merck KGaA), respectively. All the solvents used
were HPLC grade and purchased from Acros Organic (Thermo Fischer Scientific,
Inc.). All used water were Milli-Q water.