Ts. Yokum et al., SYNTHESIS OF A SERIES OF POLAR, ORTHOGONALLY PROTECTED, ALPHA,ALPHA-DISUBSTITUTED AMINO-ACIDS, Tetrahedron letters, 38(23), 1997, pp. 4013-4016
The synthesis of four novel, ''cationic'', alpha-alpha-disubstituted a
mino acids is described. The new amino acids use an orthogonal protect
ion scheme making them suitable for incorporation via solid-phase pept
ide synthesis. (C) 1997 Elsevier Science Ltd.