A 5 + 1 Protic Acid Assisted Aza-Pummerer Approach for Synthesis of 4-Chloropiperidines from Homoallylic Amines
作者:Rene Ebule、Sagar Mudshinge、Michael H. Nantz、Mark S. Mashuta、Gerald B. Hammond、Bo Xu
DOI:10.1021/acs.joc.8b03162
日期:2019.3.15
We report that HCl·DMPU induces the formation of (thiomethyl)methyl carbenium ion from DMSO under mild conditions. Homoallylic amines react with this electrophile to generate 4-chloropiperidines in good yields. The method applies to both aromatic and aliphatic amines. The use of HCl·DMPU as both non-nucleophilic base and chloride source constitutes an environmentally benign alternative for piperidine
Intramolecular nitration–aminocarbonylation of unactivated olefins: metal-free synthesis of γ-lactams
作者:Dong Chen、Meishan Ji、Chen Zhu
DOI:10.1039/c9cc03736e
日期:——
Disclosed herein is a novel, metal-free synthesis of γ-lactams through the radical-mediated nitration–aminocarbonylation of unactivated olefins. The reaction is initiated by a nitro radical generated from the homolysis of tert-butyl nitrite. The intramolecular cyanamide serves as the aminocarbonylating reagent. This protocol offers an environment-benign method to produce the synthetically valuable
multicomponent 1,2-perfluoroalkylation carbonylation of alkenes has been developed. This protocol allows the synthesis of β-perfluoroalkyl-substituted amides, esters, and related derivatives using olefins, carbon monoxide, commercially accessible perfluoroalkyl iodides, and a variety of nucleophiles including low nucleophilic amides and urea derivatives in a one-pot manner. As an example, readily available
A novel Pd(II)-catalyzed oxidative approach to construct polysubstituted pyrroles from N-homoallylicamines and arylboronic acids was developed. This transformation is supposed to proceed through cascade formation of C-C and C-N bonds via oxidative arylation of unactive alkenes, followed by intramolecular aza-Wacker cyclization.