研发了向γ,δ-不饱和β-二羰基化合物中的第一个催化不对称共轭加成物。用手性二烯-铑(I)μ-氯二聚体作为甲苯/ H 2 O的催化剂,γ,δ-不饱和β-二羰基化合物与芳基硼酸的不对称共轭芳基化反应高效进行,具有出色的对映选择性。生成的β-二羰基产物是通用的手性合成子,可以容易地转化为多种重要的手性结构。
Asymmetric Organocatalytic [4 + 1] Annulations: Enantioselective Construction of Multifunctionalized Spirocyclopentane Oxindoles Bearing α,α-Disubstituted α-Amino-β-keto Esters
作者:Chuan-Chuan Wang、Jian Huang、Xin-Hao Li、Søren Kramer、Guo-Qiang Lin、Xing-Wen Sun
DOI:10.1021/acs.orglett.8b00927
日期:2018.5.18
α-disubstituted α-amino-β-keto esters was achieved through [4 + 1] annulation of oxindoles and α-imine-β-oxo-γ,δ-unsaturated esters under mild conditions in good yields (up to 82%) and stereoselectivities (up to >20:1 dr, 96% ee). The reaction is amenable to gram scale synthesis using catalyst loading as low as 1 mol %. The corresponding chiral α,α-disubstituted α-amino-β-keto esters could be easily transformed
通过在温和的条件下,于[4 +1]环化吲哚和α-亚胺-β-氧代-γ,δ-不饱和酯,可以实现具有α,α-二取代的α-氨基-β-酮基酯的螺硫辛酯的高对映选择性。良率(高达82%)和立体选择性(高达> 20:1 dr,96%ee)。该反应适合于使用低至1mol%的催化剂负载进行克规模的合成。相应的手性α,α-二取代的α-氨基-β-酮基酯可以很容易地转化为环戊[ b ]吲哚衍生物,而不会破坏对映体纯度。
Catalytic Asymmetric Conjugate Arylation of γ,δ-Unsaturated β-Dicarbonyl Compounds
asymmetric conjugate addition to γ,δ-unsaturated β-dicarbonylcompounds was developed. With a chiral diene–rhodium(I) μ-chloro dimer as the catalyst in toluene/H2O, asymmetric conjugate arylation of γ,δ-unsaturated β-dicarbonylcompounds with arylboronic acids proceeded in high efficiency with excellent enantioselectivities. The generated β-dicarbonyl products are versatile chiral synthons, which can
研发了向γ,δ-不饱和β-二羰基化合物中的第一个催化不对称共轭加成物。用手性二烯-铑(I)μ-氯二聚体作为甲苯/ H 2 O的催化剂,γ,δ-不饱和β-二羰基化合物与芳基硼酸的不对称共轭芳基化反应高效进行,具有出色的对映选择性。生成的β-二羰基产物是通用的手性合成子,可以容易地转化为多种重要的手性结构。