作者:Michael Slany、Peter J. Stang
DOI:10.1055/s-1996-4331
日期:1996.8
Homocoupling of ethyl 4-chloro-3-quinolinecarboxylate (9) with (Ph3P)2NiBr2 in the presence of zinc and tetraethylammonium iodide yields the enantiomeric diethyl (RS)-4,4’-biquinoline-3,3’-carboxylate 10. Two ways of chemical resolution are described: reaction of the (RS)-4,4’-biquinoline-3,3’-dicarboxylic acid chloride 12 with (S)-(-)-α-methylbenzylamine led to the diastereomeric amides 13a and b, which could be separated and transformed with thionyl chloride to the enantiomerically pure 4,4’-biquinoline-3,3’-dinitriles (S)-14a and (R)-14b. Reaction of 12 with (-)-menthol yielded the diastereomeric (-)-dimenthyl esters 16a and b, which could also be separated and transformed into the enantiomerically pure diethyl 4,4’-biquinoline-3,3’-dicarboxylates 10a and b.
在锌和四乙基碘化铵存在下,4-氯-3-喹啉羧酸乙酯 (9) 与 (Ph3P)2NiBr2 发生同偶联反应,得到对映体 (RS)-4,4'- 联喹啉-3,3'-羧酸二乙酯 10。描述了两种化学分解方法:(RS)-4,4'-联喹啉-3,3'-二羧酸氯化物 12 与(S)-(-)-δ-±-甲基苄胺反应生成非对映异构体酰胺 13a 和 b,可将其分离并用亚硫酰氯转化为对映体纯的 4,4'-联喹啉-3,3'-二腈 (S)-14a 和 (R)-14b。12 与(-)-薄荷醇反应生成非对映的(-)-二薄荷酯 16a 和 b,它们也可以分离并转化为对映体纯的 4,4'-喹啉-3,3'-二甲酸二乙酯 10a 和 b。