作者:Sakie Kawahara、Ayako Nakano、Tomoyuki Esumi、Yoshiharu Iwabuchi、Susumi Hatakeyama
DOI:10.1021/ol035102j
日期:2003.8.1
[reaction: see text] beta-Isocupreidine (beta-ICD)-catalyzed asymmetric Baylis-Hillman reactions of aromatic imines with 1,1,1,3,3,3-hexafluoroisopropyl acrylate (HFIPA) give (S)-enriched N-protected-alpha-methylene-beta-amino acid esters. In contrast to the corresponding aldehydes, imines show the opposite enantioselectivity. A mechanistic proposal governed by hydrogen bonding is presented.
[反应:请参见文本]β-异cup啶(β-ICD)催化的芳香亚胺与1,1,1,3,3,3-六氟异丙基丙烯酸酯(HFIPA)的不对称Baylis-Hillman反应生成了富含(S)的N-保护的α-亚甲基-β-氨基酸酯。与相应的醛相反,亚胺显示相反的对映选择性。提出了由氢键控制的机械方案。