[C:1]([NH:4][CH:5]1[CH2:10][CH2:9][O:8][C:6]1=[O:7])(=[O:3])[CH3:2].[CH3:11][SH:12]>>[C:1]([NH:4][C@H:5]([C:6]([OH:8])=[O:7])[CH2:10][CH2:9][S:12][CH3:11])(=[O:3])[CH3:2]Subsequently the N-acetyl-2-aminobutyrolactone (1 eq) was reacted with various bases in MeSH to give N-acetylmethionine. A mixture of N-acetylaminolactone, base and MeSH (14 eq) was heated in a sealed autoclave. After cooling, expansion and removal of MeSH, the remaining oil was analysed by HPLC. Further details and the yield of N-acetyl-L-methionine achieved are listed in the table below:
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