Controlled Synthesis of Cis or Trans Isomers of 1,3-Disubstituted Tetrahydroisoquinolines and 2,5-Disubstituted Pyrrolidines
作者:Jacques Eustache、Pierre Van de Weghe、Didier Le Nouen、Hiroshi Uyehara、Chizuko Kabuto、Yoshinori Yamamoto
DOI:10.1021/jo0501543
日期:2005.5.1
Ag(I)-catalyzed intramolecular N-alkylation to afford 1,3-disubstituted 1,2,3,4-tetrahydroisoquinolines was examined. In the absence of additional substituents, Pd(II) allows a facile access to the cis isomers, while Ag(I) favors formation of the trans isomers. The same observation was made for the synthesis of 2,5-disubstituted pyrrolidines. Possible reasons for the observed stereoselectivities are discussed
检查了Pd(II)-或Ag(I)催化的分子内N-烷基化以提供1,3-二取代的1,2,3,4-四氢异喹啉的立体选择性结果。在没有其他取代基的情况下,Pd(II)易于与顺式异构体接触,而Ag(I)有利于反式异构体的形成。对于2,5-二取代的吡咯烷的合成,进行了相同的观察。讨论了观察到的立体选择性的可能原因。