160142-25-6Relevant articles and documents
Optically active 3-amino-2H-azirines as synthons for enantiomerically pure α,α-disubstituted α-amino acids: Synthesis of the α-methylphenylalanine synthons and some model peptides
Bucher,Linden,Heimgartner
, p. 935 - 946 (2007/10/02)
The synthesis of a novel 2-benzyl-2-methyl-3-amino-2H-azirine derivative with a chiral amino group is described. Chromatographic separation of the diastereoisomer mixture yielded the pure diastereoisomers 9a and 9b which are the D- and L-2-methylphenylalanine ((α-Me)Phe) synthons, respectively. The reaction of 9a and 9b with thiobenzoic acid and with Z-leucine yielded the monothiodiamides 10a and 10b and the dipeptide derivatives 11a and 11b, respectively. Methanolysis of 11b yielded 12b. The absolute configuration of 10a was established by X-ray crystallography. The absolute configuration of (α-Me)Phe in 12b has been deduced from the known configuration of L-leucine.
A highly enantioselective synthesis of phosphate triesters
Nakayama, Kensaku,Thompson, Wayne J.
, p. 6936 - 6942 (2007/10/02)
A general methodology for the preparation of both enantiomers of a variety of trialkyl phosphates with enantiomeric excesses ranging from 87 to 92% is described. Bis(2,4-dichlorophenyl) phosphoramidates bearing a 2-substituted pyrrolidine moiety as the chiral auxiliary are prepared and examined for their stereoselectivity. Considerations based on both the absolute configuration of the product phosphates as well as the X-ray structural determination of one of the bis(2,4-dichlorophenyl) phosphoramidates suggest these substitutions occur with preponderant inversion of configuration at phosphorus.