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
Quinim: A New Ligand Scaffold Enables Nickel-Catalyzed Enantioselective Synthesis of α-Alkylated γ-Lactam
作者:Xianqing Wu、Jingping Qu、Yifeng Chen
DOI:10.1021/jacs.0c07126
日期:2020.9.16
Herein, we report a nickel-catalyzedreductive cross-coupling reaction of easily accessible 3-butenyl carbamoyl chloride with primary alkyl iodide to access the chiral α-alkylated pyrrolidinone with broad substrate scope and high ee. The current art of synthesis still remains challenging on the enantioselective α-monoalkylation of pyrrolidinones. The newly designed chiral 8-quinoline imidazoline ligand
在此,我们报告了镍催化的 3-丁烯基氨基甲酰氯与伯烷基碘的还原交叉偶联反应,以获得具有广泛底物范围和高 ee 的手性 α-烷基化吡咯烷酮。目前的合成技术对吡咯烷酮的对映选择性 α-单烷基化仍然具有挑战性。新设计的手性 8-喹啉咪唑啉配体(Quinim)对于保持反应性和对映选择性至关重要,以确保单取代烯烃的还原环化,从而前所未有地合成手性非芳香杂环。
Rare‐Earth‐Metal‐Catalyzed Synthesis of Azaindolines and Naphthyridines via C−H Cyclization of Functionalized Pyridines
We report herein a rare‐earth‐metal‐catalyzed insertion of a 2‐pyridineC(sp2)−H bond into an intramolecular unactivated vinyl bond. This reaction provides streamlined access to a range of azaindolines in moderate to excellent yields. The salient features of this reaction include simple and mild reaction conditions, 100% atom efficiency, and wide substrate scope. This methodology is also used to construct
Transition-Metal-Free Synthesis of Tertiary Aminocyclopropanes
作者:Patrick Cyr、Alexandre Côté-Raiche、Sarah M. Bronner
DOI:10.1021/acs.orglett.6b03345
日期:2016.12.16
A transition-metal-free methodology for the construction of pharmaceutically relevant tertiary aminocyclopropanes is reported. Hydrazonamides, safe and stable carbene precursors, undergo smooth cyclopropanation with vinyl arenes in the presence of a base. The reaction proceeds with stereoselectivity to favor the Z isomer and provides facile access to a variety of substitution patterns through variation