Tandem N-Alkylation−C-Allylation Reaction of α-Imino Esters with Organoaluminums and Allyltributyltin
摘要:
On treatment of various alpha-imino esters with organoaluminum reagents and allyltributyltin in the presence of benzoyl peroxide, the tandem reaction proceeded to give the N-alkylation-C-allylation products in good yields. The tandem N-alkyation-C-cyanation also proceeded using silyl or aluminum cyanide to give the aminonitrile in good yield.
Conjugated imines and iminium salts as versatile acceptors of nucleophiles
作者:Makoto Shimizu、Iwao Hachiya、Isao Mizota
DOI:10.1039/b814930e
日期:——
development of synthetic methodologies where nucleophilicaddition reactions to imino carbons are utilized in crucial steps. This article summarizes double nucleophilicaddition reactions with alpha,beta-unsaturated aldimines, addition reactions using alkynyl imines, "umpoled" reactions of alpha-imino esters, and the use of iminium salts as reactive electrophiles.
reactivity of α-imino thioesters indicates that they are very reactive substrates for Umpolung N-alkylation. In fact, treatment of α-aldimino thioesters with dialkylzinc reagents in the presence of aldehydes or imines gives three-componentcoupling products in good yields.
α-亚氨基硫酯反应性的理论计算表明它们是 Umpolung N -烷基化反应活性很高的底物。事实上,在醛或亚胺存在下用二烷基锌试剂处理α-醛亚氨基硫酯可以以良好的收率得到三组分偶联产物。
Asymmetric Synthesis of α-Allyl-α-Aryl α-Amino Acids by Tandem Alkylation/π-Allylation of α-Iminoesters
作者:John M. Curto、Joshua S. Dickstein、Simon Berritt、Marisa C. Kozlowski
DOI:10.1021/ol500506t
日期:2014.4.4
The first asymmetric synthesis of α-allyl-α-aryl α-amino acids by means of a three-componentcoupling of α-iminoesters, Grignard reagents, and cinnamyl acetate is reported. Notably, the enolate from the tandem process provides a much higher level of reactivity and selectivity than the same enolate generated via direct deprotonation, presumably due to differences in the solvation/aggregation state.
Tandem N-Alkylation−C-Allylation Reaction of α-Imino Esters with Organoaluminums and Allyltributyltin
作者:Yasuki Niwa、Makoto Shimizu
DOI:10.1021/ja029639o
日期:2003.4.1
On treatment of various alpha-imino esters with organoaluminum reagents and allyltributyltin in the presence of benzoyl peroxide, the tandem reaction proceeded to give the N-alkylation-C-allylation products in good yields. The tandem N-alkyation-C-cyanation also proceeded using silyl or aluminum cyanide to give the aminonitrile in good yield.