Photo-induced Decarboxylative Heck-Type Coupling of Unactivated Aliphatic Acids and Terminal Alkenes in the Absence of Sacrificial Hydrogen Acceptors
作者:Hui Cao、Heming Jiang、Hongyu Feng、Jeric Mun Chung Kwan、Xiaogang Liu、Jie Wu
DOI:10.1021/jacs.8b11218
日期:2018.11.28
boronates are among the most versatile building blocks that can be found in every sector of chemical science. We herein report a noble-metal-free method of accessing such olefins through a photo-induced decarboxylative Heck-type coupling using alkyl carboxylic acids, one of the most ubiquitous building blocks, as the feedstocks. This transformation was achieved in the absence of external oxidants through
1,2-二取代的烯烃,如乙烯基芳烃、乙烯基硅烷和乙烯基硼酸酯,是化学科学各个领域中最通用的结构单元。我们在此报告了一种无贵金属的方法,该方法使用烷基羧酸(最普遍的结构单元之一)作为原料,通过光诱导脱羧 Heck 型偶联获得此类烯烃。这种转变是在没有外部氧化剂的情况下通过有机光氧化还原催化剂和钴肟催化剂的协同组合实现的,H2 和 CO2 作为唯一的副产物。控制实验和 DFT 计算都支持基于自由基的机制,最终导致开发出脂肪族羧酸、丙烯酸酯和乙烯基芳烃的选择性三组分偶联。
Reaction of 1-arylpropenyl-lithium with t-alkyl bromides. The influence of substituent electronic effects and additives on the course of the reaction
The reaction of 1-arylpropenyl-lithium (1a–c) with t-alkylbromides proceeds by either a nucleophilic substitution or single electron transfer mechanism, the preferred pathway being a function of electronicsubstituenteffects and the absence or presence of tetramethylethylenediamine or hexamethylphosphoramide.
Reaction of phenyl-substituted allyllithiums with tert-alkyl bromides. Remarkable difference in the alkylation regiochemistry between a polar process and the one involving single-electron transfer
Un chemin reactionnel polaire favorise l'attaque au niveau du site phenyl substitue (C-1) tandis qu'un couplage au niveau de l'autre site (C-3) se produit de facon predominante dans le cas d'un mecanisme SET
Un chemin reactnel polaire favourise l'attaque au niveau du site phenyl substitue (C-1) tandis qu'un couplage au niveau de l'autre site (C-3) se produit de facon predominante dans le cas d'un mecanisme SET
Nickel-Catalyzed Reductive Allylation of Tertiary Alkyl Halides with Allylic Carbonates
作者:Haifeng Chen、Xiao Jia、Yingying Yu、Qun Qian、Hegui Gong
DOI:10.1002/anie.201705521
日期:2017.10.9
of all C(sp3) quaternarycenters has been successfully achieved under Ni‐catalyzed cross‐electrophile coupling of allylic carbonates with unactivated tertiary alkyl halides. For allylic carbonates bearing C1 or C3 substituents, the reaction affords excellent regioselectivity through the addition of alkyl groups to the unsubstituted allyliccarbonterminus. The allylicalkylationmethod also exhibits
NOVEL MALONIC ACID SULFONAMIDE DERIVATIVE AND PHARMACEUTICAL USE THEREOF
申请人:Yoshida Tomohiro
公开号:US20100228026A1
公开(公告)日:2010-09-09
The invention provides a sulfonyl malonamide derivative, or a pharmacologically acceptable salt thereof or a solvate thereof, that has therapeutic and/or preventive effect(s) on various diseases due to its agonist action at AT
2
receptor, and is useful as a pharmaceutical agent for the treatment and/or prevention of diseases involving the renin-angiotensin-aldosterone system (RAAS).