摘要:
The iridium-complexes 3 and 4 with cyclohexane-backbone derived from quinoline were easily synthesized. The key step is cis/trans stereoselective reduction of 2-(quinolin-2-yl)cyclohexanone 5 to trans-2-(quinolin-2-yl)cyclohexanol 6 using Al(Oi-Pr)(3)/i-PrOH and the following diastereomeric optical resolution of racemic 6 using 0.50 equiv (S)-mandelic acid in EtOAc. These complexes were used in the asymmetric hydrogenation of (E)-1,2-diphenylpropene with up to 13% ee/48% cony. using 3 and 35% ee/9% cony. using 4. For the hydrogenation of (2H-chromen-3-yl)methanol, up to 80% ee/95% yield and 72% ee/96% yield were achieved. The same configuration of the products by using 3 and 4 suggested that the absolute configuration was controlled by the configuration of the stereogenic quinolinyl-bearing carbon of the complexes.