Extraterrestrial C~(alpha)-tetrasbstituted alpha-amino acids as inducers of homochirality on earth

摘要

A recent analysis of the amino acid content of the Murchison meteorite,fallen over Australia in 1969,has revealed the presence of four C~(alpha)-tetrasubstituted alpha-amino acids,namely isovaline (Iva),(C~(alpha)-methyl norvaline [(alphaMe)Nva],C~(alpha)-methyl isoleucine isoleucine [(alphaMe)Ile],and C~(alpha)-methyl alloisoleucine [(alphaMe)aIle)] with a small,but significiant,L(S) enantiomeric excess (up to 9%) [1].