| 摘要 |
L-cysteine and derivatives thereof of the formula (I): RS-CH2CHCOOH (I) ¦ NH2 wherein R is selected from the group consisting of hydrogen, C1-C15 alkyl, C2-C15 alkenyl, C6-C15 aryl, C7-C15 aralkyl, are prepared by a process which comprises reacting beta -substituted L-alanine having the formula (II): X-CH2CHCOOH (II) ¦ NH2 wherein X is selected from the group consisting of halogen, -OR' and -SR'; wherein R' is selected from the group consisting of hydrogen, allyl, C1-C15 alkyl, C6-C15 aryl and C7-C15 aralkyl, with a thiol, or hydrogen sulfide, of the formula (III): |
