作者:Steven D. Bull、Stephen G. Davies、Simon W. Epstein、Michael A. Leech、Jacqueline V. A. Ouzman
DOI:10.1039/a803124j
日期:——
A new chiral auxiliary (3S)-N,Nâ²-bis(p-methoxybenzyl)-3-isopropylpiperazine-2,5-dione 7 has been developed for the asymmetric synthesis of α-amino acids. The auxiliary 7 employs a novel chiral relay network based on non-stereogenic N-benzyl protecting groups which enhance the diastereoselectivity observed during alkylation of its C6 enolate 25.
我们开发了一种新的手性辅助剂 (3S)-N,Nâ²-双(对甲氧基苄基)-3-异丙基哌嗪-2,5-二酮 7,用于δ-氨基酸的不对称合成。辅助剂 7 采用了一种基于非固有 N-苄基保护基团的新型手性中继网络,从而提高了其 C6 对映体 25 烷基化过程中观察到的非对映选择性。