A highly efficient asymmetric synthesis of methoxyhomophenylalanine using michael addition of phenethylamine
作者:Masahiko Yamada、Nobuo Nagashima、Junzo Hasegawa、Satomi Takahashi
DOI:10.1016/s0040-4039(98)02023-1
日期:1998.12
A practical method for (S)-p-methoxyhomophenylalanine (S)-1 by using diastereoselective Michael addition as a key step was reported. Thus, the Michael addition of(S)1-phenethylamine (S)-3 to p-methoxy-trans-benzoylacrylic acid 2 was performed in a highly stereoselective (up to 98% d.e. and up to 90% yield) fashion and, subsequently, the resultant adduct 4a was catalytically hydrogenated to afford (S)-1 almost quantitatively. The most likely mechanism of the addition reaction was dynamic resolution. (C) 1998 Elsevier Science Ltd. All rights reserved.