A. Marston and E. Hecker***** Institut für Biochemie, Deutsches Krebsforschungszentrum, Im Neuenheimer Feld 280, D-6900 Heidelberg, FRG Z. Naturforsch. 38b, 1015-1021 (1983); received March 28, 1983 Amino Acids, Peptides, Phorbol Esters, Irritants, Tumour Promoters The synthesis of a series of 12-O-amino acyland 12-0-peptidyl-13-acetate and -13,20diacetate esters of the tetracyclic diterpene al...

The title compound, C5H9NO4·H2O, is an isomer of the α-amino acid glutamic acid that crystallizes from water in its zwitterionic form as a monohydrate. It is not one of the 20 proteinogenic α-amino acids that are used in living systems and differs from the natural amino acids in that it has an α-methyl group rather than an α-H atom. In the crystal, an O-H⋯O hydrogen bond is present between the ...

The synthesis of chiral α-amino acid derived (1,2,3-triazol-4-yl)-picolinamide ( tzpa ) ligands 4–6 designed by combining the coordination properties two well-known ligand structures within a single unit is described.

Mild, efficient and racemization-free synthesis of N-protected α, β-unsaturated γ-amino esters with unprecedented high E- stereoselectivity is described. This method is found to be compatible with Boc-, Fmoc- and other side chain protecting groups. The crystal conformations of the vinylogous γ-amino esters in monomers and in homo- and mixed dipeptides are studied. Further, the vinylogous homo-d...

Herein, we report the first palladium/MPAA catalyzed enantioselective C-H activation/[4+1] annulation of diarylmethyltriflamide and olefins to construct chiral cis-1,3-disubstituted isoindoline derivatives. The use readily accessible mono N-protected amino acid...

The three-component Petasis borono-Mannich reaction starting with easily accessible N-protected α-amino aldehydes produces efficiently and diastereoselectively 1,2-trans-diamines with an enantiomeric excess of up to 98%.

Chiral β-amino acids occur as constituents of various natural and synthetic compounds with potentially useful bioactivities. The pyridoxal 5'-phosphate (PLP)-dependent S-selective transaminase from Mesorhizobium sp. strain LUK (MesAT) is a fold type I aminotransferase that can be used for the preparation of enantiopure β-Phe and derivatives thereof. Using x-ray crystallography, we solved struct...