Synthesis of new C^α-tetrasubstituted α-amino acids

• Andreas A. Grauer and
• Burkhard König

Beilstein J. Org. Chem. 2009, 5, No. 5, doi:10.3762/bjoc.5.5

• before use. Silica gel 60 (230–400 mesh) was used for column chromatography. TLC was carried out with silica gel 60 F254 plates. Visualization was accomplished by UV light and ninhydrin staining. All NMR spectra were recorded on a Bruker Avance 300 (300 MHz) instrument with external standard. For NMR