Boron Tribromide-Assisted Chiral Phosphoric Acid Catalyst for a Highly Enantioselective Diels–Alder Reaction of 1,2-Dihydropyridines
作者:Manabu Hatano、Yuta Goto、Atsuto Izumiseki、Matsujiro Akakura、Kazuaki Ishihara
DOI:10.1021/jacs.5b08693
日期:2015.10.28
BBr3-chiral phosphoric acid complexes are highly effective and practical Lewis acid-assisted Brønsted acid (LBA) catalysts for promoting the enantioselective Diels-Alder (DA) reaction of α-substituted acroleins and α-CF3 acrylate. In particular, the DA reaction of α-substituted acroleins with 1,2-dihydropyridines gave the corresponding optically active isoquinuclidines with high enantioselectivities
BBr3-手性磷酸配合物是一种高效实用的路易斯酸辅助布朗斯台德酸 (LBA) 催化剂,用于促进 α-取代丙烯醛和 α-CF3 丙烯酸酯的对映选择性 Diels-Alder (DA) 反应。特别是,α-取代的丙烯醛与 1,2-二氢吡啶的 DA 反应得到了相应的具有高对映选择性的光学活性异奎宁环。此外,还展示了向吲哚生物碱、长春花碱和别花红素的关键中间体的转化。