in one of my previous mails on your problem I have mentioned the highly
reliable (in our hands) procedure for H-Thr(Bu-t)-OH which is detailed in:
Wunsch E., and Jentsch J., Chem. Ber., 1964, 97, s.2490-2496
Good luck,
Igor
Laboratory of Peptide Chemistry
Branch of Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry
Pushchino, Moscow Region
142292, Russian Federation
E-mail: <rodionov@fibkh.serpukhov.su> or <Igor_Rodionov@iname.com>
Fax: (0967)-79-05-27
Phones: (0967) 73 54 42; private: (0967) 73 58 26