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.
have developed a novel synthetic route to nitrogen-containing heterocycles via radical addition–ionic cyclization reaction. Treatment of oxime ethers carrying the tosyloxy group with Et3B and alkyl iodide in the presence of Lewis acid gave the substituted pyrrolidines and piperidines. The reaction of oxime ethers carrying the methoxycarbonyl group proceeded under the same conditions to give the amino
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
Chemoselective reductive alkynylation of tertiary amides by Ir and Cu(<scp>i</scp>) bis-metal sequential catalysis
作者:Pei-Qiang Huang、Wei Ou、Feng Han
DOI:10.1039/c6cc05318a
日期:——
We report herein a convenient and versatile method for the direct reductive alkynylation of tertiary amides to give propargylic amines through sequential Ir-catalysed hydrosilylation - Cu(I)-catalysed alkynylation. The reactions proceed...