Inverse electron-demand aza Diels-Alder reaction of aldimine with enol ethers proceeded under the influence of a phosphoric acid diester, derived from (R)-BINOL, to give tetrahydroquinoline derivatives with excellent enantioselectivity.
Inverse electron-demand aza Diels-Alder reaction of aldimine with enol ethers proceeded under the influence of a phosphoric acid diester, derived from (R)-BINOL, to give tetrahydroquinoline derivatives with excellent enantioselectivity.
Diels or no Diels: The titled reaction of aldehydes, anilines, and cyclopentadiene, promoted by 0.5–5 mol % of an N,N′‐dioxide scandium complex, afforded ring‐fused tetrahydroquinolines that contained three contiguous stereocenters. The one‐pot reaction delivers the products with good yields and excellent diastereo‐ and enantioselectivities.
Diels or no Diels:醛,苯胺和环戊二烯的标题反应,由0.5-5 mol%的N,N'-二氧化scan络合物促进,得到包含三个连续立体中心的环稠合四氢喹啉。一锅法反应可提供高收率,出色的非对映和对映选择性的产物。
Catalytic asymmetric aza Diels-Alder reactions using a chiral lanthanide Lewis acid. Enantioselective synthesis of tetrahydroquinoline derivatives using a catalytic amount of a chiral source
作者:Haruro Ishitani、Shū Kobayashi
DOI:10.1016/0040-4039(96)01655-3
日期:1996.10
presence of a catalytic amount of the chiral ytterbium Lewis acid, which was prepared from Yb(OTf)3, (R)-(+)-BINOL, diazabicyclo[5.4.0]undec-7-ene (DBU), and an additive, achiral imines reacted with achiral dienophiles to afford the corresponding tetrahydroquinoline derivatives in high yields with high diastereo- and enantioselectivities. This is the first example of aza Diels-Alder reactions using a catalytic