1: With 1-propanephosphonic acid cyclic anhydride; N-ethyl-N,N-diisopropylamine in ethyl acetate T=0°C; 0.166667 h; 2: With sodium tetrahydroborate in water; ethyl acetate T=0°C; 0.583333 h;

1: C16H22NO4PolS With 3-methyl-phenol; trifluoroacetic acid 0.25 h; Automated synthesizersolid phase reaction; 2: N-tert-butoxycarbonyl-O-benzyl-L-serine With 1-methyl-pyrrolidin-2-one; benzotriazol-1-ol; diisopropyl-carbodiimide 1 h; Automated synthesizersolid phase reaction; 3: BOC-glycine; N-tert-butoxycarbonyl-L-alanine; N-tert-butoxycarbonyl-L-phenylalanine; N-Boc-L-threonine benzyl ether; BOC-S-4-methoxybenzyl-L-cysteine; N6-[[(2-Chlorophenyl)methoxy]carbonyl]-N2-[t-butyloxycarbonyl]-L-lysine; N-BOC-D-tryptophan; Boc-Asn(Xan)-OH Further stages;