Efficient Asymmetric Synthesis of (<i>S</i>)- and (<i>R</i>)-<i>N</i>-Fmoc-<i>S</i>-Trityl-α-methylcysteine Using Camphorsultam as a Chiral Auxiliary
作者:Satendra Singh、Samala J. Rao、Michael W. Pennington
DOI:10.1021/jo049622j
日期:2004.6.1
resulting in the formation of (S)-α-methylcysteine from (1R)-(+)-2,10-camphorsultam and (R)-α-methylcysteine from (1S)-(−)-2,10-camphorsultam after acidic hydrolysis. Subsequent protection of the side chain thiol group with trityl alcohol and α-amine function with Fmoc-OSu furnished fully protected (S)- and (R)-N-Fmoc-S-trityl-α-methylcysteine in overall 20% yield.