suppliers and used without further purification. Thin layer chromatography
(TLC) was performed on aluminum plates coated with 60 F254 silica from Merck. Flash chromatography was carried out using a
Biotage SP4, Biotage Isolera, or Varian automated flash system with
Silicycle or GraceResolve normal phase silica gel prepacked columns.
Fractions were collected at 254 nm or if necessary on all wavelengths
between 200 and 400 nm. Microwave irradiation was performed in a Biotage
Initiator Sixty in sealed vials. Reactions were irradiated at 2.45
GHz and were able to reach temperatures between 60 and 250 °C.
Heating was at a rate of 2–5 °C/s, and the pressure was
able to reach 20 bar. Final compound purity is >95%.