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Synthesis of N- and S- protected norcysteines.
(i) acetone, reflux, 5 h or diethylether, RT, overnight; (ii) tert-butylthiol/tritylthiol/ 2,4,6 - trimethoxybenzylthiol, benzene, PTSA, Dean-Stark, reflux, 6 h; (iii) Me3SiCHN2, benzene:methanol (4:1); (iv) Papain, CH3CN:buffer(3:2), pH 6.2.
