Enantiomerically pure sultams (-)-2, (+)-3 and (+)-4 were synthesized.Their uses as new chiral auxiliaries in asymmetric Diels-Alder reactions with diastereoselectivity up to 99∶1 are presented. The relationship betw...Enantiomerically pure sultams (-)-2, (+)-3 and (+)-4 were synthesized.Their uses as new chiral auxiliaries in asymmetric Diels-Alder reactions with diastereoselectivity up to 99∶1 are presented. The relationship between the structure of chiral sultam and the effectiveness of asymmetric induction in Diels-Alder reactions are also discussed.展开更多
Experimental results are reported for the CuCl2-mediated asymmetric oxidative coupling of 2-naphthols in the presence of [-]α-methylbenzylamine to optically active (S)-(-)-1,1-bi-2-naphthol. Under anhydrous con...Experimental results are reported for the CuCl2-mediated asymmetric oxidative coupling of 2-naphthols in the presence of [-]α-methylbenzylamine to optically active (S)-(-)-1,1-bi-2-naphthol. Under anhydrous conditions and with a 3∶1 molarity ratio of α-methylbenzylamine to 2-naphthol, a fair enantioselection has been observed(up to 80.6% ee).展开更多
文摘Enantiomerically pure sultams (-)-2, (+)-3 and (+)-4 were synthesized.Their uses as new chiral auxiliaries in asymmetric Diels-Alder reactions with diastereoselectivity up to 99∶1 are presented. The relationship between the structure of chiral sultam and the effectiveness of asymmetric induction in Diels-Alder reactions are also discussed.
文摘Experimental results are reported for the CuCl2-mediated asymmetric oxidative coupling of 2-naphthols in the presence of [-]α-methylbenzylamine to optically active (S)-(-)-1,1-bi-2-naphthol. Under anhydrous conditions and with a 3∶1 molarity ratio of α-methylbenzylamine to 2-naphthol, a fair enantioselection has been observed(up to 80.6% ee).