Enantioselective Syntheses of 2,5-Disubstituted Pyrrolidines Based on Iridium-Catalyzed Allylic Aminations-Total Syntheses of Alkaloids from Amphibian Skins
作者:Martin Gärtner、Robert Weihofen、Günter Helmchen
DOI:10.1002/chem.201100649
日期:2011.6.27
A broadly applicable route to trans‐2,5‐disubstituted pyrrolidines has been developed. Key steps are an asymmetric iridium‐catalyzed allylic amination, a Suzuki–Miyaura coupling, and an intramolecular aza‐Michael addition. Enantiomeric excesses in the range of 93–99 % ee have been achieved. Total syntheses of the alkaloids (−)‐225 C, (+)‐ and (−)‐223 H (xenovenine), (+)‐223 AB, (+)‐195 B, and (+)‐223 R
已经开发出广泛适用的反式-2,5-二取代吡咯烷酮的方法。关键步骤是不对称铱催化的烯丙基胺化,Suzuki-Miyaura偶联和分子内氮杂-Michael加成。对映体过量已达到93–99%ee的范围 。生物碱的全合成( - ) - 225℃,(+) -和( - ) - 223ħ(xenovenine),(+) - 223 AB,(+) - 195乙,和(+) - 223 - [R已作为应用程序进行。