Versatile One-Pot Reductive Alkylation of Lactams/Amides via Amide Activation: Application to the Concise Syntheses of Bioactive Alkaloids (±)-Bgugaine, (±)-Coniine, (+)-Preussin, and (−)-Cassine
Direct entry: One‐pot reductivealkylation of lactams/amides with Grignard reagents has been realized vialactam/amideactivation with Tf2O. This method opens a direct entry to α‐alkylated amines. The versatility of the method is illustrated by the concisesyntheses of bioactivealkaloids (±)‐bgugaine, (±)‐coniine, (+)‐preussin, and (−)‐cassine.
A New Method of α-Functionalization for Tertiary Amines by Nucleophilic Substitution of α-Siloxy Amines
作者:Norihiro Tokitoh、Renji Okazaki
DOI:10.1246/bcsj.61.735
日期:1988.3
α-Siloxy amines, which were easily prepared by “silicon Polonovski reaction” of tertiary amine N-oxides with trialkylsilyl trifluoromethanesulfonate, were treated with various nucleophiles to give the corresponding α-functionalized tertiary amines in moderate to good yields. This new method has the advantage that it enables the α-substitution of amines not only by alkyl groups but also by alkenyl and
A Direct and General Method for the Reductive Alkylation of Tertiary Lactams/Amides: Application to the Step Economical Synthesis of Alkaloid (−)-Morusimic Acid D
Full details of the direct and general method for the reductive alkylation of tertiary lactams and amides to give tertiary sec-alkylamines are presented. This one-pot method consists of in situ activation of a lactam or an amide with Tf2O/DTBMP, addition of a Grignard reagent, and reduction of the resulting iminium intermediates. Alkyl, benzyl, and aryl Grignard reagents and several reductants or reducing
Nucleophilic substitution reaction of α-siloxyamines with organometallics: a new method for α-substitution of tertiary amines via their n-oxides
作者:Norihiro Tokitoh、Renji Okazaki
DOI:10.1016/s0040-4039(01)91231-6
日期:1984.1
α-Siloxyamines obtained from tertiaryaminesvia their N-oxides react with Grignard reagents and trialkylaluminums to afford newtertiaryamines having an α-substituent derived from the organometallics.
作者:Qing Wang、Xiangzhang Tao、Shengyang Ni、Yi Pan、Yi Wang
DOI:10.1021/acs.orglett.3c02082
日期:2023.8.11
establishing C(sp3)–N bonds from alkyl substrates in cross-couplingchemistry using palladium and nickel catalysts. Therefore, the methods of constructing C(sp3)–N bonds remain rare from alkyl electrophiles. The existing routes are limited to copper catalysis and photoredox catalysis. Here, we demonstrate an alternative amination strategy for rapid construction of C(sp3)–N bonds from accessible alkyl electrophiles
双分子亲核取代S N 2 是烷基亲电试剂胺化最早也是最重要的手段;其实际应用很大程度上限于初级或活化基质。此外,持续的挑战在于使用钯和镍催化剂在交叉偶联化学中从烷基底物建立C(sp 3 )–N键。因此,从烷基亲电子试剂构建C(sp 3 )–N键的方法仍然很少。现有的路线仅限于铜催化和光氧化还原催化。在这里,我们展示了一种替代的胺化策略,用于从可接近的烷基亲电子试剂中快速构建 C(sp 3 )–N 键,该策略在镍催化下通过 Ni (III) 物种高效还原消除用作自由基前体。