Dual-Activation Asymmetric Strecker Reaction of Aldimines and Ketimines Catalyzed by a Tethered Bis(8-quinolinolato) Aluminum Complex
作者:Joshua P. Abell、Hisashi Yamamoto
DOI:10.1021/ja907268g
日期:2009.10.28
aldimines and ketimines. Although catalytic asymmetric addition of cyanide to imines to generate alpha-amino-protected nitriles (the Strecker reaction) has been extensively studied in the past, alternative, easier-to-handle reagents for this process are required for modern organicsynthesis. To date, there are a limited number of reports utilizing alternative sources of cyanide other than KCN/HCN or TMSCN
(EWG) and silylatednucleophiles was developed to furnish coupling products in high yields, thus opening up new frontiers in organocatalyzed reactions. This reaction proceeded through the activation of N‐halogenated amides by a nitroxyl‐radical catalyst, followed by carbon–carbon coupling with silylatednucleophiles. Studies of the reaction mechanism indicated that the nitroxyl radical activates N‐halogenated