1: pivaloyl-alanine With 1,2,2-trichloro-1,1,2-trichloro-ethane; triphenylphosphine in toluene T=5°C; 2 h; 2: (2S-trans)-L-glutamine With sodium hydroxide in water; toluene; Petroleum ether T=10°C; pH=12; 1.5 h; 3: With hydrogenchloride; sulfuric acid Product distribution / selectivity; more than 3 stages;