Synthesis of a Pseudoenantiomer of β-Isocupreidine (β-ICD), a Chiral Amine Catalyst for Asymmetric Baylis-Hillman Reactions
作者:Susumi Hatakeyama、Ayako Nakano、Keisuke Takahashi、Jun Ishihara
DOI:10.3987/com-05-s(k)38
日期:——
9R)-3,9-Epoxy-6'-hydroxy-11-norcinconane (23), a pseudoenantiomer of β-isocupreidine (β-ICD), was synthesized starting with a fragmentation reaction of 10-bromo-10,11-dihydroquinine, prepared from quinine. Baylis-Hillman reaction of benzaldehyde with 1,1,1,3,3,3-hexafluoroisopropyl acrylate (HFIPA) using 23 as a chiral amine catalyst gave the corresponding S-enriched adduct in high optical purity (93%
(3S,8S,9R)-3,9-Epoxy-6'-hydroxy-11-norcinconane (23) 是 β-isocupreidine (β-ICD) 的假对映异构体,由 10-溴- 10,11-二氢奎宁,由奎宁制成。使用 23 作为手性胺催化剂,苯甲醛与丙烯酸 1,1,1,3,3,3-六氟异丙酯 (HFIPA) 的 Baylis-Hillman 反应得到相应的高光学纯度 (93% ee) 的富硫加合物,而β-ICD 催化的反应,得到富含 R 的加合物。